Have the first two participants improv any scene they like. Tell them to exagerate gestures and movements to make the game more fun. When the people watching feel inclined, they can tap one of the actors.
When they tap the actor, that actor must freeze in the position they’re in, then leave the stage. The tapper takes his place and must come in in the same position the previous actor was in. He then proceeds to improv based on that position.
The other actor who did not leave the stage must keep improving based on the new situation.
For example, Actor 1 and Actor 2 are talking about their marriage. Actor 1 takes a seat. Actor 3 taps actor Actor 1 out, and Actor 3 sits in the chair and says, “Get out of here! I’m going to the bathroom!”