God, I love the Marvel vs. DC parodies of the Mac vs. Apple commercials from ItsJustSomeRandomGuy.

This one is Batman vs. Iron Man. It made me laugh until water shot out of my nose. May cause extreme embarrassment if you watch while at work because you'll be snorting like a waterbuffalo. Loudly.

Video courtesy of this thread at the StraightDope message board: Bigger Ass: Tony Stark or Bruce Wayne.