At a dinner party, René Descartes’ wife posts him next to the shrimp table and tells him not to let the guests eat until an hour after midnight. When a guest reaches for a shrimp, Descartes stops him and says, “I think they’re for 1 a.m.”

René Descartes is sitting in a bar. The bartender asks him if he’d like another drink. He says, “I think not” — and vanishes.

“I think, therefore Descartes is.” — Saul Steinberg

There was a young student called Fred
Who was questioned on Descartes and said:
“It’s perfect clear
That I’m not really here,
For I haven’t a thought in my head.”

— V.R. Ormerod

In 1988 German artist Rosemarie Trockel offered a 210 x 160-centimeter linen panel on which the words cogito ergo sum had been knitted — by machine.