Jimmy Fallon And Justin Timberlake Just Did Another "History Of Rap" Mash-Up

Stephen Colbert made his big debut on The Late Show last night, during which his time-slot rival over on The Tonight Show, Jimmy Fallon, wished him well.

That collegial attitude lasted but one evening.

During Colbert's second show, Fallon brought back bestie Justin Timberlake to steal ratings perform the sixth rendition of their "History of Rap" mash-up, featuring spirited renditions of "Straight Outta Compton", "Summertime", "Bugatti" and "Ignition (Remix)", among, like, forty others.

The late night wars are back!