Watch Late Night with Jimmy Fallon Online - Full Episodes

If you need a pick-me-up, here's the new viral video of the First Lady shaking her thing with Jimmy Fallon... all to encourage moms and kids to get out and move!

You might be finding yourself in need of a pick-me-up today, so here you go: a video of U.S. Marines dancing and lip syncing to Carly Rae Jepsen's "Call Me Maybe."

I know, I know, "Call Me Maybe" is on that breaking point where we're all about to be very, very sick of it (if we aren't already). But listen: Jimmy Fallon and The Roots performed the song with Carly Rae Jepsen on "Late Night with Jimmy Fallon" using only toy instruments found in a classroom. It's just enough to make the song totally awesome.

The world hasn't heard a new Dave Matthews Band album since 2009's Big Whiskey And The GrooGrux King. After 20 years touring, the remaining members took all Summer 2011 off. Last night, Matthews resurfaced on "Late Night" with guitar in hand, and sounded like he'd hardly missed a beat.....

Oh, it's just not fair sometimes. Imagine if schedules had been flipped, Lil' Wayne had made his scheduled "Jimmy Kimmel Live" appearance last night, and Lindsay Lohan had guested on Kimmel's show instead of "Late Night With Jimmy Fallon." America could've been treated to the two troubled entertainers exchanging fairly-recent legal system tour impressions.

Suppose some marvel of mad science built a celebrity-fusing super-collider. Suppose you somehow lured ultra-pious Denver Broncos quarterback phenom Tim Tebow and a "Ziggy Stardust"-era David Bowie into this thing. Don't get hung up asking who would do that, or why. Let's just do the time-warp again, and go with it, savvy? "Late Night" snark-meister Jimmy Fallon's Nobel Prize probably isn't exactly in the mail, but behold his creation that answers this seconds-old, provocative query: "Tebowie.

Louis C.K.'s experimental online special made him $1 million in just 10 days, which he decided was way too much money. Watch Louis talk about the charities he chose to give to in the worst way possible in this video from his appearance on "Late Night with Jimmy Fallon."

Questlove says he's sorry that he and "Late Night With Jimmy Fallon" played an inside joke on Michele Bachmann during the presidential hopeful's visit to the show. But he's amazed at how her followers have fired back with insults like "n%^&er f#$khead ghetto stick."

Now would be a bad time to be a member of The Roots: not only have NBC execs publicly issued GOP presidential candidate Michele Bachmann's requested public apology over an obscure musical insult on "Late Night With Jimmy Fallon," but they've also apparently landed on house band The Roots with both feet.

I'm sure that when The Roots, who play as Jimmy Fallon's house band on his late night show, played the opening of the song "Lyin' Ass Bitch" as GOP candidate Michelle Bachmann took the stage, they weren't trying to make any kind of sexist remark. But that's how Bachmann took it, and now she wants an apology.