The Arctic Monkeys returned to the Late Show with David Letterman last night to perform "Don't Sit Down 'Cause I've Moved Your Chair," the witty, up-tempo first single from their fourth album, Suck It and See. Letterman is a big fan of the young British indie rockers, but couldn't resist cracking a joke about the record's title. "I'm being told it's their Christmas album," Letterman quipped.