http://www.snopes.com/radiotv/tv/frosties.asp
I like that Skittles commercial where there are these teenagers sitting on a rainbow and when the one kid questions its existence, he falls through it.
On Adult Swim there's this commercial for Robot Chicken (narrated in the traditional deep gravelly voice, of course), and it's like:
"In the light of a dim pale blue dawn, you've waited...
But now that thing you've been waiting for the happening of is here...
....to bring the waitingness....
....to an endingness."
It's amusing.