My favorite are the Expedia.com ads - the contrast between the sniveling, simpering pathetic males and the strong, decisive, self assured females in those ads is unequaled.
There is a Mike's hard lemonade commercial (I think that is the name) that makes me crack up because it is so ridiculous.
Some player kind of guy walks by an attractive blonde sitting at the bar talking with (presumably) her date. He does this three times saying rather cheesy pickup lines each time. On the third occasion, the guy finally grows a pair and says "Alright, you have to the count of three ..." but before he can finish, the woman has head-butted the boor. And they both go back to sippin their hard lemonade. Yeah, like I am going to believe that would be possible in real life.
I guess this group already has a discussion of that commercial.
http://www.mensactivism.org/article.pl?sid=04/05/30/0410234&mode=flat
What about the Adelphia ads?
In one ad, there is a cute little chicky that is standing in front of 3 moronic sloppy jerks, and she calls them losers.
In the other ad, a guy and his family are all together, and suddenly the poor slob is struck by lightning. At the end of the commercial, there is a family picture with them all smiling, but he charred and his hair is standing on end, from the lightning.