Harold
A harold is a long form game for five to eight players.
The ref takes three or four suggestions from the audience, and actors line up and begin monologues based on the suggestions. Eventually, an actor will have an idea for a scene and will step forward and begin acting. Those not in this scene clear the stage.
Two or three actors do the scene, and before they can reach any resolution, two new actors come in front of them and start a new scene. They continue till two actors interrupt them and perform their own short scene.
Before that scene can finish, an actor steps forward and starts a filler game.
After that game has been going on for some time, the actors from the first of the three scenes resume their scene. After a few minutes of acting, the second scene resumes, followed by the third scene. Then actors do another filler game before doing a final three scenes, wrapping up all three storylines.
Chicago improv group The Second City's Del Close allegedly invented the Harold. Referencing A Hard Day's Night where George Harrison answered "What would you call that hairstyle" with Arthur, Close answered "What do we call this game" with "Harold."