Of all the Saturday Night Live [1] players in history, Jimmy Fallon is the one who is most likely to crack up mid-skit [2]. That's just a scientific fact. Over the weekend, The Tonight Show host unexpectedly appeared with Tina Fey [3] on their former stomping grounds, "Weekend Update," as undecided voters from suburban Pennsylvania. Fey commits, but Fallon may or may not have forgotten all his lines — plus, how to do his accent. It's funny, just don't expect it to make any sense.