Make sure you have a partner and two mics. One person says a few simple things on the mic, and the second person repeats everything they say.
This is a great exercise if you’re having trouble getting someone to participate because they are shy or can’t think of anything to say. Shy folks won’t feel like they are saying something stupid if you say it first. Keep it simple and don’t go too fast. Pretty soon instead of just repeating, your partner will start embellishing what you’ve said, replying to you and adding their own lines. Freestyle!
Saying questions and statements are good, because it’s easy for them to forget you’re playing a repeating game and actually answer the question or personalize the statement.