Knighting Americans: Which U.S. Celebs Deserve the Title ‘Sir’ or ‘Dame’?

David Letterman

Why he might be knighted: The Indiana-born Letterman just celebrated his 30th consecutive year as late night’s lankiest (and crankiest) host. Surely his longevity and influence count for something? (AP Photo/Eric Reichbaum)

NEXT: Dame Joan Rivers?