Heard a story of a flight to Las Vegas several years back that had a great bunch of passengers and a fun crew. On the way out an announcement was made from the cockpit that they were going to play a little bingo and that the bingo cards were located in the seat backs right there in front of them. If they were unable to locate them, just ring your Flight Attendant call button. The numbers then started coming B5, C7, A1....... Of course there were no bingo cards in the seat backs and within seconds almost every seat was ringing for a flight attendant to get their bingo cards as the numbers kept coming. Passengers were going crazy as they were missing the numbers due to no cards. I may try that one someday - Or Not.