Last Night on Late Night: Will Arnett Twitter-Challenged Jimmy Fallon From David Letterman’s Account


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 "syphilis"; 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.