I'm surpirsed that they haven't been mentioned yet, but those fucking mobile phone ringtones ads. They are lame and constantly on (even on pay TV you can't escape them). I remember when Crazy Frog was all the rave and that ad was on every ad break, very very annoying!
Also that cologate 'whiteing toothpaste for sensitive teeth'. It reeks of superficiality, like when the girl says "I wanted a tooth paste that was sensitive8) but I didn't want to give up things,8) like having having white teeth8) ' she rolls her eyes occassionally as though its an accessary to her use of punctuation.
Theres more but I've got to think. Good thread