The very best ads only seem to appear very selectively and for a short space of time. Such as the surpriseyourwoman.com ad or the cable channel ad where the naked woman hides in the meter cupboard.
My best one was the first ever WKD ad, where one bloke was in a lift, and his mates put a fake brick wall in front of the doors, so he couldnt get out. He then starts shouting "Help, theres someone stuck in the lift!" Classic. After that, the WKD ads just go downhill