Last Wednesday was Spain's over-ripe tomato food-fight festival, Tomatino. Sad, you missed it, but you can still look at photos, which are somewhere between slapstick and cultural phenomemon.
In the meantime, plan ahead, and maybe you can catch a different but equally fascinating and incredibly bizarre festival-for example, El Colacho, the baby-jumping festival, where people (can you guess?) jump over babies. Or Up Helly-Aa, which revolves around annually incinerating a 32-foot Viking longship replica. Or the most aesthetically pleasing, Holi, Hindu festival of colors, where people spend a day dousing each other with colored powders and water... far easier on the eyes than a bunch of Spaniards rolling in vegetable juice.