Sure, they can act, sing, dance and work the heck out of a red carpet, but we asked celebs to reveal the kind of hidden talents that David Letterman would love
Ben Affleck: "I can move my scalp and [make] people think I have a wig on."
Alicia Keys: "I am the best at cracking my neck. People tell me I'm going to break it, but I haven't found the discipline to stop."
Wilmer Valderrama: "I unicycle. It started out when I was really bored as a kid. I rode around my garage just the other day."
Paige Davis (Trading Spaces): "I sing 'Amazing Grace' to the tune of both the Dallas and Gilligan's Island theme songs at parties."
Sean Astin: "I can catch coins off my elbow. I learned that when I was a little kid."
Eric Balfour (The O.C.): "I can tie a cherry stem into a knot with my tongue."
Charlotte Church: "I do the splits."
Richard Kind (The Station Agent): "I can put my fist in my mouth. Everybody knows that I have the biggest mouth in the world, so it's my birthright."
Ben Chaplin: "I do a really good Donald Duck."
Marlon Wayans: "I burp the national anthem."
Chad Lowe: "I throw grapes really high in the air and catch them in my mouth."
Amber Tamblyn (Joan of Arcadia): "I'm double-jointed in all my fingers. I can also bend my thumb completely back to touch my hand. I'm a freak of nature."
Vincent Curatola (The Sopranos): "I wiggle my right ear."
Deborah Gibson: "I can hula hoop for hours on end [without dropping it]. As a kid, I'd say, 'I want to set the world record.'"
Justin Guarini: "I can actually snap my toes, like other people snap their fingers."
Dominic Monaghan (The Lord of the Rings): "I can walk on my hands for pretty much as long as I want."
Mark McGrath (Sugar Ray): "I am an excellent juggler. If a show's really going bad, I might take the mic, a guitar and a drum head and start juggling."
Paul Rudd (Friends): "I can make my tongue [curl into a clover shape]. It happened as soon as I made my pact with Satan."
Rosie O'Donnell: "I can balance anything on my finger, including furniture—tables, chairs, anything. Nobody would believe me, but when I was on my show I started doing it and people were like, 'Will you stop?'"
Robin Williams: "Ventriloquism and naked juggling."
Cindy Margolis: "I tap-dance to HBO theme songs. I have a Sex and the City dance and [one for] Curb Your Enthusiasm."
Dustin Hoffman: "I can blow a bubble on the tip of my tongue. It's really small, like a pea. You give it a 'pfluft' and it floats off. Kids love it."