By Amber Ray
Updated March 27, 2014 at 01:34 PM EDT
Credit: Nathaniel Chadwick/NBC

Jimmy Fallon took his special rapport with other celebrities — or is that total fanboy fawning? — to a new level last night when Bill Cosby stopped by The Tonight Show.

When the comedy legend took the stage, Fallon admitted that he can’t help but break out his Cosby impersonation while in his presence. “Because when I talk to you,” the late-night host said, pausing between words, “I…slow…everything…down….” Fallon even broke out those famous Cosby Show dance moves. The only thing he was missing, in fact, was a Cosby sweater:

The Cos, meanwhile, was a good sport, giving the audience one of his trademark Cliff Huxtable “Are you sure you want to do that?” looks as Fallon shimmied behind him. And though he feigned an exit, Cosby did stick around for an interview — and a tightrope walk across the Studio 6B stage:

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