Lull in the conversation? Looking for something to do between courses at dinner? Enjoy extorting money from your friends? Play the 50 states game! Ask another person to write down all 50 US states in under 15 minutes. It sounds easy, but due to the limitations of human memory, and a general disinterest in geographic knowledge, people are exceptionally bad at it.
WARNING: Do not play this game with English citizens or other foreign nationals!! While eight consecutive Americans have failed to beat the clock, two English chaps have passed the test. This game is only appropriate for stupid Americans.