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• I don't think so," said Ren'e Descartes. Just then, he vanished.
• I think, therefore I am. -- Rene Descarte
• Cogito, ergo sum. (I think, therefore I am) -- Rene Descarte
• I think not, said Descartes; and promptly disappeared.
• Rene Descartes was a drunken fart, `I drink therefore I am.'
• One spring morning Descartes was strolling in a suburb of Paris.
  A local tavern owner recognized him and asked, "Would you honor me by tasting the new excellent wine I just received....
• Shit Happens' according to... Descartes: I think, so why am I in this shit?
  I shit, therefore I am....
• Descartes thought an animal, that couldn't talk, couldn't think, or so he taught, but to summise, my cat thinks otherwise.