Show Me This Dance
Players in a circle. One player points at another and names a fictional dance ("Snappy Penguin," "Grabbing Some Bread," "The Angry Wheelbarrow"). The player pointed at must create a dance inspired by that name, and the other members of the group copy as it's being done. After a few moments, another player (neither the one who made up that dance or the dancer) will point at someone else and name another ficitonal dance.
To be silly. To be instantly inspired by a suggestion. To wake up physically.