Dad joke::nooo🗣:yus:::A horse walks into a bar and orders a pint.

The bar keep says "you're in here pretty often, do you think you're an alcoholic?" The horse replies "no I don't think I am..." and vanishes out of existence…

See the joke is about Descartes' famous quip "I think therefore I am" but to explain that at the beginning of the joke would be putting Descartes before the horse.