René Descartes walks into a bar... ?

Question

René Descartes walks into a bar.

The bartender says, "Would you like a drink?"

Descartes answers, "I think not."

What happens next?

Answer 1

The bartender finds that Rene' doesn't exist anymore, as he is just taking up space and money. Mr. Descartes is rendered "persona non grata".

Answer 2

He (Rene) slowly disappeared!

Very old joke, smile.

Be well.

Answer 3

He dies/disappears.

Answer 4

Therefore he ain't.  

Answer 5

The bartender then asks, "So what do you want?"

Descartes says, "Where are my bones? Some writer's taken them to use in a book."

The bartender says, "Yes, I know that writer, and he's a man of little faith."

Answer 6

Standard joke: He disappears

Uber joke: He turns into an existentialist.