Okay so the all-type ads themselves aren't the reason.
Nor their slightly condescending tone
Not even the "did an ad agency really do that?" factor.
Nope. This is all about misspelling.
You see this month, Ketel One is running an ad in Entertainment Weekly (among other places) with their list of the 50 Best Movies Ever Made. The ad asks you if you agree or disagree, but gives no vehicle to express your opinion.
But that's still not it.
No. The idiots cited "Battleship Potempkin" (sic) as one of the movies. That's not a typo. That's someone who's unfamiliar with the term "Potemkin Village" and/or the actual name of the movie. Not to mention an agency (or a CMO-- not sure an agency does those ads) that can't be bothered to hire a proofreader.
UPDATE (8.29.07): Today's ad in the Wall Street Journal has the correct spelling. Finally.