David Letterman really digs Future Islands. Like, really digs Future Islands. By now, we’ve all seen the band’s performance on The Late Show Monday Night and Letterman’s subsequent freakout. In the aftermath, he’s turned Samuel T. Herring’s dancing into a reoccurring bit. On several occasions during last night’s episode, Letterman exclaimed “Let’s dance!” before producers switched to a clip of Future Islands’ performance and, more specifically, Herring’s unique moves. It happened twice during just the opening monologue, as you can see below. Apparently he also has a “Let’s sing!” clip involving Russian President Vladimir Putin.