Could the Aristocrats joke have been a hoax?

What if the Aristocrats movie, the entire thing, was a hoax? Penn Jillette is friends with Bob Saget and has connections to Gilbert Godfried, Jackie Martling, and lots more comedians. Let's say around 2000, Penn thought it would be really funny to come up with a fake joke and convince people that it was old, from the vaudeville era. He told Saget and Saget spread it to a few guys. Then word got out of this inside joke to other comedians. Suddenly, everyone began to know of it, trying to one up each other. However, each comedian was told to be hush-hush about the joke.
Okay, here's the genius Penn is: He told Matt Stone and Trey Parker to make the South Park clip and that was leaked early. Then Gilbert did the joke during a Friar's Roast. Of course, none of this is prior to 2001.
Jackie Martling mentions the joke on his website. Interesting, considering he's friends with Penn. There's a mention of a book from 1972 with the joke in it. As of now, no one has physically located the book.
Let's face it. There has been NO PRIOR MENTION OF THE JOKE BEFORE 2001. A joke going back to vaudeville will leak. Would Andrew Dice Clay not have taken a shot at telling the joke? How about Sam Kinison? Nothing can be held secret for that long. If one person knows it, surely it would have leaked on the internet before.
I'm not one for conspiracies. I'm a complete skeptic; however, the proof is all there.