you should play a MIND game
it goes like so
you tell your friends to play. they start playing.
the rules.
if your around anyone playing the game... and say the word "MINE".... and one of the other players points out that your said MINE... you have to immeatly do 10 push ups.... no matter where you are....
same goes for all your friends, if they say MINE... and you call them on it... then they do 10 push ups...
just go to a really nice restraunt 1 week after you all agree to play.... when someone gets up to go to the bathroom, take their napkin.
when they get back, say "hey... why do i have 2 napkins?"
the friend will then say "oh thats mine"
the friend will then do 10 pushups right in the middle of the restraunt.
its loads of fun.