Feb. 22, 2014 at 2:12 AM ET
Jimmy Fallon closed out his first week hosting "The Tonight Show" in what fans were calling "the best thing ever." In other words, the comedian spent an entire hour with his partner in musical laughs, pop star Justin Timberlake. And even better, the duo launched into the fifth edition of their popular "History of Rap" series from "Late Night" before a single word was uttered during JT's interview.
This time, the pair dropped the rhymes of LL Cool J, Beastie Boys, Tone Loc, Will Smith, Salt-N-Pepa, Notorious BIG, Snoop Dogg/Lion, Warren G, Kriss Kross, Ludacris, Run DMC and many, many others.
They didn't just show off their smooth flow during the medley, but some pretty great comedic timing as well. As Fallon ferociously rapped NWA's "Straight Outta Compton" and suddenly got in the camera's face, Timberlake quickly interjected, "Hey hey hey! Hold on a second! ... You're straight outta compton?!" And just in time too, as Fallon was about to drop some of the tune's naughty words.
The host, not quite the performer Timberlake is, later complimented his guest for pulling off the five-minute-long move bustin' jam session with ease. "I'm always passed out ... I'm a big, doughy sweat ball," Fallon joked. "And you're getting on a treadmill and running!"
Drippy mess or not, fans didn't care. They just loved the performance, making "HistoryOfRap" a top trend on Twitter before the show was even over.
But there was more to the pair's reunion than their rap skills. Fallon and Timberlake, who paired up for several sketches on the Dec. 21 episode of "Saturday Night Live," played up their bromance.
"I can't thank you enough for coming here our first week. You know what a big deal it is for me. I really appreciate you being here for me. I love it, thank you," Fallon said.
"I love you man!" Timberlake gushed.
And like any good bud, the pop star took the opportunity to poke fun at his pal by impersonating him once again, as he did on "SNL" two months ago.
"So good! So good!" JT-as-Fallon enthused, complete with exuberant bounces and hand gestures. The singer admitted, "That is the most over-the-top impression ever!"
And as Fallon's first week as "Tonight Show" host went into its final moments, Timberlake couldn't help but turn and lean into his pal in hopes of some affection.
"I couldn't think of a better guy to cap off the week with," Fallon said.
And judging by viewer reaction, many would agree — and add that it was a great first week overall.
"Tonight Show Starring Jimmy Fallon" airs weeknights at 11:30 on NBC.