A horse walks into a bar, at which point the bartender asks if he’s an alcoholic given all the bars he frequents.

“I don’t think I am.” the horse replies.

poof

The horse disappears.

This is the moment where those who are into philosophy start to grin as they’re familiar with the philosophical proposition of “Cogito Ergo Sum”, or “I think, therefore I am”.

But to explain that joke beforehand would be putting Descartes before the horse.