The punch line is [you can see yourself washing windows] thy reflection in the window glass...writing is just background setup. Joke I heard on radio the guy used DJ as his job, of course. You can be doing anything, it wouldn't matter!

Sorry! I thought it was funny. Okay here's a better one.

A little boy said to his mommy: "I'm gonna draw a picture of a horse-drawn cart." The lad draws a horse.

Mommy said, "Where's the cart?"

Boy said, "The horse draws the cart."
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https://www.amazon.com/author/bonnie.mill-lemke
https://kdp.amazon.com/en_US/bookshelf