It appears to not be a joke.
Why?

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on Monday, November 12th, 2007 at 10:04 pm and is filed under cultcha, theater.
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November 13th, 2007 at 12:23 am
http://en.wikipedia.org/wiki/Jerry_Springer_-_The_Opera tells all.
November 13th, 2007 at 10:35 pm
Huh. Even weirder than I could have imagined. Thanks, John.
I should have known to just ask the internet.
However, it was slightly more fun to ask the internet via my blog.
November 14th, 2007 at 10:57 am
I had heard of it before but the involvement of Harvey Keitel struck me as a surprise.
November 15th, 2007 at 1:00 pm
I have it on good authority that it’s hi-freakin’-larious. Been playing a while on the West End, did its US preview in SF (did not read articles, personal experience, so may not, if fact, contain facts or pseuedo facts)