Ooh, I got another idea
Walk under a table and crouch down. Wait for the person eating at that table to take a bite out of their food. As soon as they are ready to take another bite, stand up and scream "SURPRISE, YOU FOUND A PERSON!" Then take their food and leave.
Or
Ask for sauce with your food. When no one is looking, rub some on your food. Then shout out "MY FOOD IS BLEEDING! Call 119!" and run out with your food. Then throw it away and walk back in and act like an angel and say "But it was!" when others question you.