From launching tomatoes to heaving tunas, people love to throw food, and some of the most spirited annual events offer an excuse to do so. Rumored to have originated as a local brawl (possibly an attack on city council members by disgruntled townspeople), La Tomatina in Buñol, Spain, is the world's largest food fight. In late August, the event attracts some 45,000 people who throw more than 250,000 pounds of overripe tomatoes at one another. “Participants have a wonderful time throwing tomatoes at anything that moves,” according to the Tourist Office of Spain. A horn signals the start of the...