I am a total sucker for clever marketing campaigns. And the Happy Cow Contest from Real California Milk totally takes the cake.
I'm sure you've seen the commercials but the audition tapes are hysterical. I cackle like a crazy woman whenever one comes on. Here is my current favorite:
You can see all of them on the website (linked above). Be sure to watch the Deleted Scenes video so you can laugh like a geek like I did.