Because of all of the stress and anxiety that you face in one game, it makes you fairly peckish, but you don't want to get up and risk ordering food in case you miss your game. And when your food does arrive, you're annoyed at the waiter for disturbing you and making a racket when you're trying to hear what numbers are being called out. Bingo makes you grumpy and hungry and your food always gets cold before you even get a chance to eat it.
