Very few people remember this one, but I swear, it was the funniest commercial EVER!
About four or five years ago, Miller Lite ran this spot where some guys were in the woods building a log cabin. At the end of their hard work, they sat back and opened up some Lite beer to celebrate. Then all of a sudden, this heavy metal guitar riff starts playing, and the singer starts singing "EVIL BEAVER...EVIL BEAVER!!" over and over again.
The evil beavers were men dressed up in beaver suits who sought revenge on the cabin builders for taking all of their wood. They came out of nowhere and started beating the crap out of the lumberjacks. The whole spot was absurd, but the FUNNIEST scene in it was the one black guy who was dressed up as a beaver who was so upset at the lumberjacks that
he bit off the wooden leg of one of the lumberjacks and was chewing on it! 
I was crying I was laughing so hard... but then, I'm easily amused.
Favorite commercial of the present:
We love the subs...we love the Quiznos subs... If you've never seen this, go to quiznos.com and click on the furry little...whatever the he** they are... on the front page.