Last night on the Late Show With David Letterman, Will Arnett took to the host’s Twitter account to stir up some more trouble with Jimmy Fallon. Plus: William H. Macy played a dirty ukelele song that rhymed “break this†with “syphilisâ€; Christina Ricci misses Quaaludes; and Whitney Cummings and Snooki greeted each other with what looked like a weird rain dance. Watch our compilation to see what you missed.
