Dart
Hobbes: How come we play war and not peace?
Calvin: Too few role models.
Calvin: I'll be the fearless American defender of liberty and democracy... and you can be the loathsome godless communist oppressor. We're at war, so if you get hit with a dart, you're dead and the other side wins, OK?
Hobbes: Gotcha.
Calvin: GO! (they shoot each other simultaneously WAP-WAP) Kind of a stupid game, isn't it?
-Bill Watterson,
"Calvin & Hobbes"

gotta share this one