Robin Williams' Funniest Thing In Years

The premise behind Set List, the uniquely innovative comedy show created and hosted by Paul Provenza (director of "The Aristocrats"), is simple: Words are projected on a screen, and stand-up comedians have to improvise jokes based on the words. It's a thrilling and exhilarating way to see a comedian test his or her chops without a safety net.

Dropping into the show recently was Robin Williams. It's easy to forget that although he's become a wildly successful actor, Williams got his start as a stand-up comedian, and it's clearly an art form he still loves. His appearance on Set List could be his funniest performance in years -- watching the flashes of inspiration appear on his face as he builds a new character or joke right in front of the audience's eyes is mesmerizing.

Check out the clip above to see Williams make up a stand-up set on the fly at NerdMelt in Los Angeles.

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