Slate just did an article on this: http://www.slate.com/id/2171623/nav/navoa/
and
http://www.slate.com/id/2156187/
I hate the VW ads that show them crashing. Those just give me the heebie jeebies. A very close second is the Fudgems from Domino's Pizza. It looks like poop and is the least appetizing thing I have ever seen!