Just did this in NYC with my friends this past weekend. The game: You and your friends go out to dinner. At the end you collect everyone's credit card, put it into a napkin, and shake it up. You then ask the waitress/waiter to pull one credit card out. Who ever gets picked has to pay the entire bill. It provides a pretty good laugh for about 20 minutes when your friend gets smacked for an $800 restaurant bill. It's pretty easy to convince people to play too since most of the time probability says that you have a very good chance of winning.