So René Descartes walks into a bar and the bartender asks him, "Would you like a beer?" ... [And] Descartes says, "I think not," and disappears in a puff of logic.

To which the standard response is:

"Didn't God Vanish in a puff of logic somewhere in the "Hitch hikers guide to the galaxy"?"

Check here for come-back:

http://ozgrid.com/forum/showthread.php?p=123606#post123606

Re And extra credit for the first to report the logical fallacy in my René Descartes walks into a bar joke

It's not your Rene Descartes joke. That's the "logical fallacy".

Ante up, Faldage. I'm going to enjoy that "extra credit".