What's your choice? My vote goes to the John Smiths ad (at least I think it is) set in the Level Head Pub, with the guy and his hands free headset. Tag line from teh barman is "You're barrrrred!". I find it hilarious....have even recorded it to show friends !! Infact, it's making me laugh just thinking about it now :oD
My fave at the moment is the maltesers ad. The one where the woman flashes her boobs to a bloke walking past her office because she doesn't feel naughty about eating the maltesers.