At first glance, visitors might think they are witnessing a remake of the cult classic film Attack of the Killer Tomatoes. As it turns out, those who happen to be in Buñol, Spain on the last Wednesday of August will merely be witnessing what has been billed as “The World’s Biggest Food Fight.”

La Tomatina dates back to the end of World War II. It is celebrated with an hour-long food fight where nearly 160 tons (145,000 kg) of tomatoes end up covering everything and everyone in sight.

There is some debate among historians about how this tradition started. Some believe that disgruntled townsfolk rioted and began throwing tomatoes. Others believe it started as little more than a food fight between friends. Whatever the cause, the result has become so popular that town officials had to limit the number of participants beginning in 2013 out of concerns for safety.