Ads that make us laugh are usually a heck of a lot more effective, and much better received by the viewer than ones that bore us or get in the way. Superbowl ads are a perfect example as they're usually talked about for days or even weeks after the game is over.
Google, current advertising mega-giant on the web, realized this and has signed a deal with Seth MacFarlane, creator of the popular Fox animated series "Family Guy" to do a series of video shorts for the AdSense network that will play along with either a video ad or some sort of text ad, encouraging users to see the ad to get to the cartoon.
Would you mind seeing video ads on websites if you got a funny cartoon or video to go along with it? It's almost like you'd be watching television.