If you've been rooting for Jimmy Fallon to succeed, NBC's promos for The Tonight Show Starring Jimmy Fallon will make you happy. It's Fallon's turn at the Tonight Show desk starting Feb. 17, and so far, the network has come out with a couple of promos for the show. The latest has Fallon doing his best impression of Tony Manero (John Travolta) from Saturday Night Fever. Won't it be nice to be able to watch Jimmy just a little bit earlier? Check out the previews now.