One of my kids and her friends invented a new version of rock-paper-scissors: they call it foot-cockroach-bomb.
To make the foot, you slap your open palm down onto your other hand; the cockroach also has the hand palm down, but with the fingers wiggling; and the bomb is a fist that “blows up” as you slowly lift your hand and wiggle your fingers (and you make the explosion sound effect). Needless to say, foot beats cockroach, cockroach beats bomb, and bomb beats foot. Just like in real life!
Gently Hew Stone 