Jimmy Fallon and Justin Timberlake have created a ton of viral moments over the years, and they're back at it. Timberlake closed out Fallon's epic first week hosting The Tonight Show by revisiting one of their standing bits: "The History of Rap." This fifth edition includes the Fresh Prince of Bel-Air theme song, The Notorious B.I.G.'s "Big Poppa," Jay Z's "99 Problems," and Aerosmith's "Walk This Way." The best part comes midway, when Timberlake stops Fallon and asks him if he really did come "Straight Outta Compton." Watch, and welcome another classic to the pantheon.