I was playing around with GPT a while back and I found that it could come up with some good jokes if I started the joke with a subject.

For example, I started with a prompt "Tell me a joke which starts with: I'm so poor, the mouse" and it completed the joke as:

"I'm so poor, the mouse in my house brings its own cheese."

Some other ones I still remember which cracked me up:

"I'm so poor, after I stepped on a cockroach, I called my accountant to see if I could claim it as a capital loss."

"You're so poor, when you declared bankruptcy, the rats in your house filed a claim for unpaid rent."

"You're so poor, you declared bankruptcy at a lemonade stand."

"You're so poor, when you walk, the dirt beneath you feels rich."

"You're so poor, dust whispers your name when it settles."

"Fickle as a squirrel at a nut convention!"

"Fickle as a dog in a fire hydrant factory!"

"Fickle as a flip-flop in a shoe shop sale!"