Would this really make you a bad person? It should have been your turn to win and they've just won a ridiculous amount of money that is really yours. it doesn't help that when you all head to the car park, you see them getting into their brand new BMV and you're certain that you spotted some diamonds lying on the back seat. Of course you would never mug a fellow Bingo player but you've definitely thought about it, even if you don't want to admit it.