Each person gets 3-5 pennies (depending on how long you want the game to last).  Sit in a circle and as you go around whosever turn it is has to say something about themselves that they think nobody else has in common with them.

If no one else has that thing in common then that player can put their penny in the middle, but if someone else has it in common the player then they can put their penny in and not the player. (if two or three people have it in common they can all put their pennies in but not the player whose turn it is, the point is to get the girls to make unique comments not "my favorite color is red").  The point is to lose all your pennies and win.