Your pick: smashed tomatoes or huge ball of twine
AFP/Getty images
It's called a "harmless" battle, but in many of the photos people are wearing goggles. I guess, just like my mom said, you can "take somebody's eye out" when you're throwing things that aren't meant to be thrown.
Of course, if Spain is a little too out of the way for you, can head to Minnesota for an equally exciting tourist attraction: