"Myślę, więc jestem."

Translation: I think, therefore I am.

[Glyn617152]

I was in a pub with Rene Descartes. I said "do you fancy another pint Rene?" He thought a while then said "I think not" and with that . . . he just disappeared.

[ChrisCrios]

A horse walks into a bar. The bartender asks 'Why the long face? Are you sad?'. The horse says 'I don't think I am' and vanishes in a puff of smoke.

This is the point when people familiar with 'Cogito ergo sum' laugh. But to explain that in advance would be putting Descartes before the horse ;)

[Ollyfer]

As the German saying goes: „Ich trinke, also bin ich.” ;-)
(I drink, therefore I am)

[Dahlie5]

Cogito ergo sum.

[Hawick2K]

;)