Desktop 1680x1050. I might try to figure out how to translate this into a t-shirt.
rock-paper-scissors: rock breaks scissors, scissors cuts paper, paper wraps rock...
...and then, for those who can whip out the hand gesture, there is SPORK!
Spork flings rock, punches holes in paper, and gums up scissors. Limit one use per friend for life, so use it wisely.