I think it was a Robin Williams joke, or was at least told by him. I think his bit was about/involved Steven Hawking as a standup comic. It might have been on the album he released in 02/03. (I don't remember the name though.)
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If you'd like to go get it, get the deluxe version. It's a two disk set that includes city/location specific jokes that were left off the album proper.
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If you'd like to go get it, get the deluxe version. It's a two disk set that includes city/location specific jokes that were left off the album proper.