Jimmy Fallon

was in town earlier today shooting a video with

The Roots

at the bar Kung Fu Necktie (1250 N. Front) in Fishtown. We’re told whatever they shot will be used in some way to promote the former “SNL” actor’s takeover of “Late Night,” which is scheduled in June 2009 when

Conan O'Brien

takes over the “Tonight Show,” from

Jay Leno

.