Cardiels "One try, do or die" Spitfire ad in Thrasher - I think this was during the first few years of my skating, but it always stuck to my mind the most.
Another one was a sequence of his noseslide on a tall, long ledge down stairs with caption along the lines of "Its beatiful to watch someone so in control and out of control at the same time...". His facial expression in the pic/seq tells the whole story.
Cardiel was, is and forever will be the king in my mind.