Do you have to be particularly quick-witted or clever or light on your feet to play that scene? Not really. It’s a perfectly straightforward conversation. The humor arises entirely out of how steadfastly the participants adhere to the rule that no suggestion can be denied. If you can create the right framework, all of a sudden, engaging in the kind of fluid, effortless, spur-of-the-moment dialogue that makes for good improv theater becomes a lot easier.