Crazy Eights is a high-energy warm up exercise.
Players form a circle. In unison, everyone lifts the right hand, shakes it quickly, and counts to 8. They repeat this with the left hand, then the right foot (kicking it in the air while balancing on the left) and finally with the left foot. Everyone immediately repeats the pattern, except this time the players only count up to 7. In each round, the players count up to one less number, until everyone is quickly waving their entire body shouting "1! 1! 1! 1!" Then everybody cheers.
Note: Players are (often) encouraged to make and momentarily hold eye contact with each other during the course of the exercise.
Same rules, except players count up in Spanish.
Similar rules, except players count up to 16 on the first round, and then to 8 on the next round, and half it at each round.
Everyone in the group must deliver each set of numbers differently, and must all decide this together instantly and organically. So the first run-through up to 8 could be delivered as, say, a pirate. Then the next run through up to 7 would have to be delivered as something different, for instance as a little girl.