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*Bill Cosby stopped by “The Tonight Show starring Jimmy Fallon” on Thursday and got a huge dose of himself – in the form of Jimmy’s impression of the veteran comic.

Before Cosby, 76, even had a chance to sit down , Fallon, 39, launched into his Cos voice.

“Cause when I talk like you, I slow everything down and start to talk like you,” he said. “And I dance like you, and I do the moves like Bill Cosby does the dance moves.”

Showing off some of the quirky dance moves from “The Cosby Show’s” opening montages, Fallon caused the star to shake his head and look away.

“Bill, don’t leave, now don’t be upset, now please.” Fallon called after him.

Watch below.