'Tonight Show' host Jimmy Fallon's love of sports, games and making his celebrity guests fully participate in both has been well documented, but last night, he took things up a notch. Well, actually, Bill Cosby took things up a notch.

The beloved comedian took the stage for an extended segment on the late-night show, basically turning Fallon's production into his own wild and woolly stand-up routine. He did everything and made fun of everyone, with Fallon giddily trailing behind and encouraging him all the way. It was cute, it was sweet, it was harmless. Of course, it might have all been so good-natured because Fallon had a trick up his sleeve: making Cosby "tightrope" the 'Tonight Show' studio.

Cosby, to his credit, had some other ideas.

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