"Put your left hand on your stomach and your right hand on your head!"
"Without taking your hand off your stomach, put your hand on my head!"
"Subtract three from seven and say 'fizzbuzz' that many times!"
"Don't follow any of these instructions until I say 'go', then do all of them simultaneously. Put your right hand on your stomach and make a fist with your left hand and say 'moop'. Are you ready to do those things?"