The waiter says to Descartes, "Would monsieur like another cup of coffee?"
Descartes says, "I think not!" And disappears.
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I just read a terrific biography about that famous existentialist crooner: Bing and Nothingness.
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Jean Paul Sarte is sitting in a cafe working on Being and Nothingness. He asks the waitress for a coffee with no cream.
The waitress says, "I'm sorry, Monsieur Sarte, we're out of cream. Would you like a coffee with no milk?"
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Miles Davis finishes his sandwich. The waitress comes over and asks him if he'd like dessert.
He says, "How's your apple pie?"
She says, "Oh, Mister Davis, the apple pie is gone."
He says, "Crazy, baby! Give me two slices!"