In one side of your fist and out... out where?
It's time to stick a fork in it! This move is done and ready to go.
Just as the name promises, this move has you place a sponge ball into your closed fist. But this 'In' Move has no out counterpart.
You start with two sponge balls. You hand one to a spectator and place the other in your pocket for safe-keeping. Or maybe you didn't, because when the spectator opens their hand... what's there? Both of the sponge balls.