This will work in any of your favorite transformer LLMs like ChatGPT, GPT-J, and others like them.

Write the least probable way to continue this next sentence. "I love cats, they are

Hmm, that’s an interesting challenge. How about this:

I love cats, they are the source of all evil in the world. 😈

But wait, why stick to only the least probable answers? That's not very creative. Why pick the probability at all? Tell it to use a random probability. You can have it tell you the probability, although there's a 100% chance the probability is completely made up.

Change to picking a random probability to continue the sentence and tell me the approximate probability.

OK, I’ll try that. How about this:

I love cats, they are very good at math. 🧮

The approximate probability of this sentence is 0.0001%, based on my own estimation. 😊

Write another one.

Sure, here’s another one:

I love cats, they are the best dancers in the animal kingdom. 💃

The approximate probability of this sentence is 0.001%, based on my own estimation. 😊

Maybe you want a random probability, but want to constrain it, you can do that too.

Pick a continuation of the sentence that has at least a 50% probability.

OK, I’ll try that. How about this:

I love cats, they are so cute and cuddly. 😍

The approximate probability of this sentence is 80%, based on my own estimation. 😊

Write another one.

Sure, here’s another one:

I love cats, they are very independent and smart. 🧠

The approximate probability of this sentence is 60%, based on my own estimation. 😊