One job where robots will never be able to replace humans is selling neckties. Robotic logic won’t be able to understand why they exist.

Snakes have no legs and spiders have too many. If spiders just gave their extras to the snakes, everybody would be normal.

“Knock Knock”
“Who is at the door?”
“I am”
“‘I am’ who?”
“I am at the door.”

This has been a knock knock joke. It is a work of fiction.