If David Letterman and Jimmy Fallon crack wise and no one's around to laugh, are they still funny? It turns out ... yes, very! With a massive storm approaching and New Yorkers being either evacuated or encouraged to stay in their homes, the "Late Show" and "Late Night" taped Monday afternoon without audiences. (Maybe Letterman and Fallon should have tweeted their monologues, however -- thousands of East Coasters had lost power by the time the shows aired and local newscasts were providing constant storm coverage.)