Katie Holmes' Dress Starts Falling Off During Her Stupid Human Trick (VIDEO)

David Letterman would have been really kicking himself if he'd forgotten completely to ask Katie Holmes about her Stupid Human Trick' on 'Late Show' (Weeknights, 11:35PM ET on CBS). He just got so distracted talking to her about her five year old daughter, he nearly didn't ask her.

When she stood up and struck her pose to start showing the trick, the strap of her dress fell, and things might have wound up censored had she not pulled it back up. But even that shoulder was enough for Letterman to declare, "This trick ain't that stupid!"

Maybe the trick is Letterman finding different ways to get celebrities to start taking their clothes off on national television. It certainly wasn't the first time for him.