If played with other actors the audience doesn't need to provide anything. Otherwise the audience should suggest rules for the actors to follow.
Actors begin a scene until they are paused by the host. Once paused the host will ask for a new rule to be introduced by either other actors not in the scene or the audience. These rules can be limitations (example: removing words, vowels, or movement) or additions (example: making a noise at the end of a sentence, maintaining eye contact, singing every line.) Each time the host pauses the scene, a new rule is added until it becomes too difficult to continue.