All players hold both hands in a finger-snapping position (like pistols). As soon as you make eye contact with someone, you must snap your fingers at them. The person who snaps last is 'dead' and freezes in place.
A frozen player can only be revived by the person who 'killed' them — by snapping at them again. The game must keep going at all times, meaning at least two players must always be alive.
This warm-up trains eye contact, quick reactions, and spatial awareness.