B-Dubs and Les-Hol dropped a beat on The Tonight Show, yo.
Jimmy Fallon filled his first week as host with shareable moments — Kristen "Harry Styles" Wiig, Will Smith's fly dance moves — but likely none more entertaining than Brian Williams performing the classic hip-hop track "Rapper's Delight" with Lester Holt on Wednesday night.
See also: Fallon's Debut vs. Leno's Finale: Which Attracted More Social Buzz?
Williams and Holt weren't actually rapping, of course — the bit is a super-cut of news clips, but the cover matches the awesomeness of the original performance by Sugar Hill Gang.

This video already has more than 21 million views on YouTube. Fallon and Timberlake say #hashtag so many times, you'll feel dumb ever using the symbol again. (Plus, anything with a Questlove cameo is instantly #awesome.)
Blessed is the mind that came up with this bizarre idea. Fallon does a spot-on impression of Neil Young, singing (of all things) the theme song to The Fresh Prince of Bel-Air.
Fallon tapped one of the most famous moms in America to help him show the "evolution of mom dancing."
The president got in on the action, too, causing a stir for surprised Late Night fans. Obama popped up on the show in 2012, helping Fallon turn a broadcast of news about student loans into a smooth slow jam.
In the height of Breaking Bad's popularity, Fallon did a parody of the show called Joking Bad. Instead of dealing crystal meth, he deals -- you guessed it -- jokes.
He capitalized on the Game of Thrones action as well, creating a nearly 10-minute parody of the fantasy series.
If you've ever wondered how Paul McCartney would sound with an American accent, here you go.
Fallon has a way with McCartney. Somehow, he convinced Macca to sing a silly, food-themed song set to the melody of "Yesterday."
The man loves dance evolutions. This time, he grabs his pal Timberlake, and the two run through end zone moves, such as the Ickey shuffle and the "taking a selfie."
This one is exactly what it sounds like: All three guys lip syncing to popular songs. Fallon tackles '80s classics such as A-Ha's "Take On Me," while Gordon-Levitt and Merchant prefer to emulate divas Nicki Minaj and Beyoncé.
The smash hit by Robin Thicke got a remix on Late Night, thanks to some help from The Roots and cheesy classroom instruments.
This skit could've come straight from the stages of Saturday Night Live. Fallon and Tatum play tween girls on a talk show called Ew.
For one of his last shows as host of Late Night, Fallon received some fatherly advice from a few special guests: the three men of Full House.
The music-loving comedian ended his run on Late Night with a performance of "The Weight" by the Band, with some help from the Muppets.
Have something to add to this story? Share it in the comments.