You skip the punchline.
She told people to stop patronizing her.
Damn! (This is my go-to joke that someone told me in highschool like 7 years ago. Felt like sharing it.)
Because 7 8 9!
Because 7 ate 9.
You provide a random set up and we provide the punchline (PTP). Most upvoted wins imaginary internet points.
Want to hear a clean joke? Bob took a bath. With Bubbles. Want to hear a dirty joke? (Punchline hidden so you don't accidentally read)
Timing
The joke is it's own pun-ishment.
B: The seed of doubt. A: Dude, that's the worst joke I've ever heard! A: Or is it the best???