While promoting his new movie The Social Network on Late Night with Jimmy Fallon, Justin Timberlake reminded audiences how he started in the entertainment business. They discuss Timberlake's love for hiphop and reminisced over the days in NSync, "you know, that little band," Timberlake says.

By surprise the host and guest take off into a HipHop Medley with The Roots (the most essential element of the show) backing the karaoke session. They endure switching off verses from staples by the Sugarhill Gang, Digital Underground, Beastie Boys, TuPac, Notorious, Kanye West, T.I, Jay-Z and more. It was a surprising addition to the typically predictable late-night spots, but these comedic musical sketches are exactly what Timberlake does so well. Oh, and Jimmy Fallon was pretty good too.