I moved to Chicago in the early 1990s and I studied improvisation there. I learned some rules that I try to apply still today. Listen, say yes, live in the moment, make sure you play with people who have your back, make big choices early and often. Don't start a scene where two people are talking about jumping out of a plane. Start the scene having already jumped. If you are scared, look into your partner's eyes. You will feel better.