Even though Jimmy Fallon and Justin Timberlake already performed a History of Rap earlier in the episode, Fallon was still dead-set on challenging DeGeneres to a contest of fake singing. They even traded some jabs prior to the contest.
— jimmy fallon (@jimmyfallon) September 9, 2015
You're about to be lip sunk. https://t.co/obu0zcHFYd
— Ellen DeGeneres (@TheEllenShow) September 9, 2015
As Timberlake judged, the duo definitely brought it, with showings from the Killers, Silento, Diana Ross, and Rihanna. Fallon might have the upper hand from pure experience, but with DeGeneres’s arsenal, the Tonight Show host never had a chance—no matter how much he tried to bribe Timberlake or bring out the whip and nae nae.
Screengrab via The Tonight Show Starring Jimmy Fallon/YouTube