Check out these two videos, if you haven't already.
Background: In his talkshow, Jimmy Kimmel's regular joke is to pretend Matt Damon's a guest. He then ends his show by apologising to Matt, saying the show's run out of time and he can't come on.
Last month, Jimmy Kimmel's real girlfriend, comedienne Sarah Silverman, went on his show and surprised him with this video.
Fast forward about a month, at his post-oscars show, Jimmy Kimmel got his revenge! Check out the stars cameo-ing in this video! Big-time!
The first video has had almost 5 million views on Youtube, and the second one, more than a million in just a day or so! Kimmel and Silverman sure got a helluva lot of mileage from this; I'd never heard of either of them before this.