This festival is held on the last Wednesday of August each year in Bunol in the region of Valencia.
La Tomatina is a festival where tons of overripe tomatoes are thrown in the streets for around one hour. It is typically a war where people throw ripe squashed tomatoes at each other which leave the participants and the towns main square dripping with bright red tomato juice.
The funniest part is that there are no winners as people just do this for fun and to enjoy themselves. You simply have to grab ripe tomatoes and throw them at anyone running, bending down, standing still, or moving.
The main rule of the La Tomatina festival is that you have to squash the tomatoes before you can throw them at somebody else.