COGNITO ERGO SUM

One evening, after a long day at work, Rene Descartes went to relax at a local tavern. The bar tender approached and said, "Ah, good evening Monsieur Descartes! Shall I serve you your usual drink?".

Tiredly, Descartes leaned back in his chair and replied, "I think not." -- and promptly vanished.

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