Ben Phillips' friend Elliot is a big fan of eating carrots with ketchup, so Ben decided to do him a favor and make him some for a snack. As less of a favor, he added baking soda to the ketchup so it would explode in Elliot's face. It was pretty funny until the vinegar began to burn Elliot's eyes; then it was hilarious. True tragedy struck, however, when bright red ketchup fell on Elliot's nice white shoes. Nobody messes with a man's shoes.
See the whole prank here.