Ping, Buzz, Ring
Thanks very much to Ralph Oborn, who sent me this game!
Sit the players in a circle. The goal is to count as a group, starting from 1 and going up towards 100, with each person in turn supplying the next number in the sequence. The trick is that instead of saying any number with a "3" or a multiple of "3" in it, you say "ping". So for example, the count starts off sound like this:
If someone goofs, the count starts over. Continue until the group reaches 100 successfully. Alternatively, this can be played as an elimination game, with people leaving the circle if they make a mistake. If the group gets really good, add "buzz" for 5's and "ring" for 7's. In this case, some numbers get really complicated to say (e.g., 35 would be "ping buzz ring")!