Rock-Paper-Scissors is the age-old way to settle a dispute, but using your own hands to play is so outdated.
You get 6 hands that fit over your fingers- two of each pose. "Hand" a set to a friend, then each of you secretly chooses one to play. Rock beats scissors, scissors beats paper, paper beats rock. 1-2-3... go!
A great gift for a friend or co-worker who needs a little mood booster.