For his return to late night TV after a two-month absence, David Letterman returned to work with a beard, Robin Williams as his guest, and -- here's the buzz-worthy moment to talk about at work -- a surprise first joke supplied by Democratic presidential candidate Hillary Clinton. Taped in Iowa and a smart counter to Mike Huckabee's appearance on NBC's "Tonight Show," Clinton said, “Dave has been off the air for eight long weeks due to the writers’ strike. Tonight he’s back. Oh well. All good things come to an end.”
