Thanks to Best Week Ever for pointing out this lovely clip featuring Jimmy Fallon and his staff preparing the "Twitter song" that appeared on the show after being requested by a fan. (The song is called "Black Thought's Favorite Dinosaurs," Black Thought being a member of The Roots, Fallon's band.)

I like the insight into the way comedy takes shape, I like the glimpse at the collaboration between the rest of the staff and The Roots, and I continue to have a great big soft spot for Jimmy Fallon and this warmly goofy program. I can't possibly be the only person much more interested in the 12:30 a.m. shows (Fallon and Craig Ferguson) than in the 11:30 p.m. shows (Leno and Letterman).

At any rate: well played, Jimmy Fallon and staff.