Requirements
Objective
Description
One person leaves the group, and the rules are explained. People randomly say ÛÏ1 upÛ ÛÏ1 downÛ ÛÏ2 upÛ ÛÏ2 downÛ or some combination of those phrases to describe the position of their arms and legs, and they can move them creatively to change.
The person who stepped out needs to try and guess the pattern.