At the opposite end of the spectrum but not worthy of starting a seperate thread: Worst Ad. (No Hijack intended. Figured it was close enough to lump in)

The current Korean Air ad is rather disturbing. Particularly the scene of the woman putting an envelope in her mouth (what happened to S.W.A.K.?) then cutting to a scene of a man holding a champaign bottle to his crotch and the cork popping.

If there's some airline analogy, I'm missing it.
In the mean time, Korea, please leave the 'high art' to Air France.