Sarah Silverman is a totally fake laugher in one of the new ads promoting YouTubes "Comedy Week," a livestreamed week-long event that will feature videos from comedians all over the world. The campaign, created by Goodby, Silverstein & Partners features people like the Lonely Island guys and Ms. Silverman talking to each other about the upcoming show. The tagline for the show is "This Better be Funny." If the ads are any indication, they will be. See all of them on the right.