stopped by Wednesday night's "extreme sports" version of the Tonight Show
with nothing to promote, but he did delight Jimmy Fallon
by acting confused and disapproving -- especially when Fallon impersonated him to his face.
"I can't help but talk like you when I talk to you," Fallon said. "'Cause when I talk to you I slow...everything...down."
Later, Fallon asked Cosby to walk a Tonight Show "tightrope," a line of tape on the floor of the studio. Cosby obliged, even when Fallon climbed on his back.
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