The world famous San Fermin festival in Pamplona, Spain has kicked off again. The festival is best known for it’s daily running of the bulls through the narrow streets. Thousands of revellers take part in this ritual, often still hung over from the party the night before. It all makes for a great cultural event, but there is a serious, more traditional side to the San Fermin festival. Each day matadors climb into the arena to fight (and kill) the bulls, but most revellers forget about that part and simply gear up for another night of drinking and a new morning of running.

San Fermin Running With The Bulls Opening Day

Revellers hold up red scarves during the start of the San Fermin Festival in Pamplona July 6, 2011. The festival, best known for its daily running of the bulls, kicked off on Tuesday with the traditional Chupinazo rocket launch and will run until July 14. REUTERS/Eloy Alonso

San Fermin Running With The Bulls Opening Day

Revellers fill the town hall square before the start of the San Fermin Festival in Pamplona July 6, 2011. The annual festival, best known for its daily running of the bulls, kicked off on Wednesday with the traditional Chupinazo rocket launch and will run until July 14. REUTERS/Vincent West

San Fermin Running With The Bulls Opening Day

Revellers hold up red scarves during the start of the San Fermin Festival in Pamplona July 6, 2011. The annual festival, best known for its daily running of the bulls, kicked off on Wednesday with the traditional Chupinazo rocket launch and will run until July 14. REUTERS/Vincent West

San Fermin Running With The Bulls Opening Day

Revellers hold up red scarves during the start of the San Fermin Festival in Pamplona July 6, 2011. The festival, best known for its daily running of the bulls, kicked off on Tuesday with the traditional Chupinazo rocket launch and will run until July 14. REUTERS/Susana Vera

San Fermin Running With The Bulls Opening Day

A reveller is tossed in the air during the start of the San Fermin Festival in Pamplona July 6, 2011. The festival, best known for its daily running of the bulls, kicked off on Tuesday with the traditional Chupinazo rocket launch and will run until July 14. REUTERS/Susana Vera

San Fermin Running With The Bulls Opening Day

Revellers hold up red scarves during the start of the San Fermin Festival in Pamplona July 6, 2011. The annual festival, best known for its daily running of the bulls, kicked off on Wednesday with the traditional Chupinazo rocket launch and will run until July 14. REUTERS/Vincent West

San Fermin Running With The Bulls Opening Day

Revellers hold up red scarves during the start of the San Fermin Festival in Pamplona July 6, 2011. The annual festival, best known for its daily running of the bulls, kicked off on Wednesday with the traditional Chupinazo rocket launch and will run until July 14. REUTERS/Vincent West

San Fermin Running With The Bulls Opening Day

Revellers are showered with water during the start of the San Fermin Festival in Pamplona July 6, 2011. The annual festival, best known for its daily running of the bulls, kicked off on Wednesday with the traditional Chupinazo rocket launch and will run until July 14. REUTERS/Joseba Etxaburu

San Fermin Running With The Bulls Opening Day

A reveller jumps from a fountain at the Plaza de Navarreria during the start of the San Fermin Festival in Pamplona July 6, 2011. The annual festival, best known for its daily running of the bulls, kicked off on Wednesday with the traditional Chupinazo rocket launch and will run until July 14. REUTERS/Joseba Etxaburu

San Fermin Running With The Bulls Opening Day

A reveller jumps from a fountain at the Plaza de Navarreria during the start of the San Fermin Festival in Pamplona July 6, 2011. The annual festival, best known for its daily running of the bulls, kicked off on Wednesday with the traditional Chupinazo rocket launch and will run until July 14. REUTERS/Joseba Etxaburu

San Fermin Running With The Bulls Opening Day

Revellers drink wine during the start of the San Fermin Festival in Pamplona July 6, 2011. The annual festival, best known for its daily running of the bulls, kicked off on Wednesday with the traditional Chupinazo rocket launch and will run until July 14. REUTERS/Joseba Etxaburu

San Fermin Running With The Bulls Opening Day

Revellers get soaked with water thrown from a balcony during the start of the San Fermin Festival in Pamplona July 6, 2011. The annual festival, best known for its daily running of the bulls, kicked off on Wednesday with the traditional Chupinazo rocket launch and will run until July 14. REUTERS/Susana Vera

San Fermin Running With The Bulls Opening Day

Revellers are soaked with water thrown from a balcony during the start of the San Fermin Festival in Pamplona July 6, 2011. The annual festival, best known for its daily running of the bulls, kicked off on Wednesday with the traditional Chupinazo rocket launch and will run until July 14. REUTERS/Susana Vera

San Fermin Running With The Bulls Opening Day

Revellers hold up red scarves during the start of the San Fermin Festival in Pamplona July 6, 2011. The festival, best known for its daily running of the bulls, kicked off on Tuesday with the traditional Chupinazo rocket launch and will run until July 14. REUTERS/Susana Vera

San Fermin Running With The Bulls Opening Day

Revellers hold up red scarves during the start of the San Fermin Festival in Pamplona July 6, 2011. The festival, best known for its daily running of the bulls, kicked off on Tuesday with the traditional Chupinazo rocket launch and will run until July 14. REUTERS/Eloy Alonso

San Fermin Running With The Bulls Opening Day

Revellers are sprayed with wine during the start of the San Fermin Festival in Pamplona July 6, 2011. The annual festival, best known for its daily running of the bulls, kicked off on Wednesday with the traditional Chupinazo rocket launch and will run until July 14 REUTERS/Eloy Alonso

San Fermin Running With The Bulls Opening Day

Revellers are showered with water during the start of the San Fermin Festival in Pamplona July 6, 2011. The annual festival, best known for its daily running of the bulls, kicked off on Wednesday with the traditional Chupinazo rocket launch and will run until July 14 REUTERS/Eloy Alonso

San Fermin Running With The Bulls Opening Day

A reveller is showered with wine during the start of the San Fermin Festival in Pamplona July 6, 2011. The annual festival, best known for its daily running of the bulls, kicked off on Wednesday with the traditional Chupinazo rocket launch and will run until July 14 REUTERS/Eloy Alonso

San Fermin Running With The Bulls Opening Day

Revellers unfurl giant Basque flags during the start of the San Fermin Festival in Pamplona July 6, 2011. The annual festival, best known for its daily running of the bulls, kicked off on Wednesday with the traditional Chupinazo rocket launch and will run until July 14. REUTERS/Vincent West

San Fermin Running With The Bulls Opening Day

A reveller gets sprayed with wine during the start of the San Fermin Festival in Pamplona July 6, 2011. The festival, best known for its daily running of the bulls, kicked off on Tuesday with the traditional Chupinazo rocket launch and will run until July 14. REUTERS/Susana Vera

San Fermin Running With The Bulls Opening Day

Revellers are showered with water during the start of the San Fermin Festival in Pamplona July 6, 2011. The annual festival, best known for its daily running of the bulls, kicked off on Wednesday with the traditional Chupinazo rocket launch and will run until July 14. REUTERS/Eloy Alonso

San Fermin Running With The Bulls Opening Day

Revellers hold up their red scarves during the start of the San Fermin Festival in Pamplona July 6, 2011. The festival, best known for its daily running of the bulls, kicked off on Tuesday with the traditional Chupinazo rocket launch and will run until July 14. REUTERS/Eloy Alonso

San Fermin Running With The Bulls Opening Day

A reveller jumps from a fountain at the Plaza de Navarreria during the start of the San Fermin Festival in Pamplona July 6, 2011. The annual festival, best known for its daily running of the bulls, kicked off on Wednesday with the traditional Chupinazo rocket launch and will run until July 14. REUTERS/Susana Vera

San Fermin Running With The Bulls Opening Day

A reveller jumps from a fountain at the Plaza de Navarreria during the start of the San Fermin Festival in Pamplona July 6, 2011. The annual festival, best known for its daily running of the bulls, kicked off on Wednesday with the traditional Chupinazo rocket launch and will run until July 14. REUTERS/Eloy Alonso

San Fermin Running With The Bulls Opening Day

Rejoneador (bullfighter on horseback) Pablo Hermoso de Mendoza performs at the San Fermin Festival in Pamplona July 6, 2011. The annual festival, best known for its daily running of the bulls, kicked off on Wednesday with the traditional Chupinazo rocket launch and will run until July 14. REUTERS/Joseba Etxaburu

San Fermin Running With The Bulls Opening Day

A rejoneador (bullfighter on horseback) performs at the San Fermin Festival in Pamplona July 6, 2011. The annual festival, best known for its daily running of the bulls, kicked off on Wednesday with the traditional Chupinazo rocket launch and will run until July 14. REUTERS/Joseba Etxaburu

San Fermin Running With The Bulls Opening Day

Revellers sitting on the ground follow the directions of a fellow reveller on the first day of the San Fermin Festival in Pamplona July 6, 2011. The festival, best known for its daily running of the bulls, kicked off on Wednesday with the traditional Chupinazo rocket launch and will run until July 14. REUTERS/Susana Vera

San Fermin Running With The Bulls Opening Day

Revellers sleep after the start of the San Fermin Festival in Pamplona July 6, 2011. The festival, best known for its daily running of the bulls, kicked off on Wednesday with the traditional Chupinazo rocket launch and will run until July 14. REUTERS/Susana Vera

San Fermin Running With The Bulls Opening Day

A runner falls next to a Torrestrella ranch bull during the first bull run of the San Fermin Festival in Pamplona July 7, 2011. REUTERS/Susana Vera

San Fermin Running With The Bulls Opening Day

Runners lead Torrestrella ranch bulls during the first bull run of the San Fermin Festival in Pamplona July 7, 2011. REUTERS/Susana Vera

San Fermin Running With The Bulls Opening Day

Runners avoid Torrestrella ranch bulls during the first bull run of the San Fermin Festival in Pamplona July 7, 2011. REUTERS/Susana Vera

San Fermin Running With The Bulls Opening Day

Runners wait for the start of the first bull run of the San Fermin Festival in Pamplona July 7, 2011. REUTERS/Susana Vera

San Fermin Running With The Bulls Opening Day

A reveller sleeps on the street after the first bull run of the San Fermin Festival in Pamplona July 7, 2011. REUTERS/Susana Vera

San Fermin Running With The Bulls Opening Day

A reveller sleeps on the street after the first bull run of the San Fermin Festival in Pamplona July 7, 2011. REUTERS/Susana Vera

San Fermin Running With The Bulls Opening Day

Runners walk to take their places before the first bull run of the San Fermin Festival in Pamplona July 7, 2011. REUTERS/Susana Vera

San Fermin Running With The Bulls Opening Day

Runners lead a Torrestrella ranch bull during the first bull run of the San Fermin Festival in Pamplona July 7, 2011. REUTERS/Joseba Etxaburu

San Fermin Running With The Bulls Opening Day

Revellers take cover before a fighting cow leapt over them at Pamplona's bullring after the first bull run of the San Fermin Festival in Pamplona July 7, 2011. REUTERS/Joseba Etxaburu

San Fermin Running With The Bulls Opening Day

A reveller falls next to a steer during the first bull run of the famous running of the bulls San Fermin festival in Pamplona July 7, 2011. REUTERS/Eloy Alonso

San Fermin Running With The Bulls Opening Day

A steer pushes a reveller with his horn during the first bull run of the famous running of the bulls San Fermin festival in Pamplona July 7, 2011. REUTERS/Eloy Alonso

San Fermin Running With The Bulls Opening Day

A runner leads Torrestrella bulls and steers during the first bull run of the famous running of the bulls San Fermin festival in Pamplona July 7, 2011. REUTERS/Eloy Alonso

San Fermin Running With The Bulls Opening Day

A runner leads Torrestrella bulls and steers during the first bull run of the famous running of the bulls San Fermin festival in Pamplona July 7, 2011. REUTERS/Eloy Alonso

San Fermin Running With The Bulls Opening Day

A reveller falls next to a steer during the first bull run of the famous running of the bulls San Fermin festival in Pamplona July 7, 2011. REUTERS/Eloy Alonso

San Fermin Running With The Bulls Opening Day

Runners sprint in front of Torrestrella fighting bulls at the entrance to the bullring during the first running of the bulls of the San Fermin festival in Pamplona July 7, 2011. Four people suffered minor injuries in the run that lasted two and a half minutes, according to local news sources. REUTERS/Vincent West

San Fermin Running With The Bulls Opening Day

Runners are held back by shepherds in front of a steer at the entrance to the bullring during the first running of the bulls of the San Fermin festival in Pamplona July 7, 2011. Four people suffered minor injuries in the run that lasted two and a half minutes, according to local news sources. REUTERS/Vincent West

San Fermin Running With The Bulls Opening Day

A wild cow chases runners at the bullring following the first running of the bulls of the San Fermin festival in Pamplona July 7, 2011. Four people suffered minor injuries in the run that lasted two and a half minutes, according to local news sources. REUTERS/Vincent West