[Via Will Hines](http://www.willhines.net/2007/07/31/give-me-back-my-son/), a terribly delightful improv warmup game that pays tribute to Mel Gibson:
(Warning: Video contains a lot of overacting and yelling.)
Will explains:
> So the warm-up works like this: everyone stands in a circle except one in the middle. That person approaches someone in the outer circle and demands “Give me back my son!” with complete dramatic commitment — inspired by Mel Gibson’s over-dramatic delivery in the movie Ransom — trying to get the outer circle person to laugh. It’s to practice emotional commitment and also making your teammates laugh — two valuable skills.