Justin Timberlake and Jimmy Fallon ended their long week of hanging out together on Late Night this past Friday, and they did it with a bang.

Justin was there all week in promotion of his new album, 20/20 Experience.

The two friends banged out another version of their now-popular “The History of Rap,” which included some Beastie Boys, some Jay-Z, and even some Fat Boys and Slick Rick.

Check out Jimmy and Justin, backed by the best band in late night, The Roots, for today’s Viral Video of the Day.

Need some more viral videos to keep you entertained? Here are just a few of Surfer Stephen’s favorites:

• Young Justin Timberlake & Jimmy Fallon Sing At Summer Camp
• Katharine McPhee Meets Russell Brand
• Jimmy Fallon & Bruce Springsteen Cover ‘Sexy & I Know It’