Talking of annoying/stupid adverts recently, these 2 do it for me:
1) The Eircom one on radio about the number of people switching back to them.
They say at the end that its 'subject to availability' - surely if you were with Eircom and moved, and are now considering moving back then getting the signal wouldnt be an issue?
2) The Halfords adverts for the little cartoon man fitting a SatNav. After he fits it he says, "There you go, it'll take you home now". If you got to Halfords from your house, surely you would know the way back?