"Cogito, ergo sum." joke

Rene Descartes walks into a bar, really thirsty and hankering for a cool beer. The bartender, seeing a person of such celebrated status walk in, thinks "I've got to set this guy up with something really nice!" So he says to Descartes, "Mr. Descartes, would you like a nice snifter of cognac or perhaps some whisky from Scotland? On the house?"
Descartes replies, "Oh, I think not"...and promptly disappears!

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