Stochastic Consistency Test

Of course! Here are 5 jokes:

1. I'm reading a book on anti-gravity. It's impossible to put down.
2. Why don't scientists trust atoms? Because they make up everything.
3. What do you call a fake noodle? An impasta.
4. Why did the scarecrow win an award? He was outstanding in his field.
5. I told my wife she was drawing her eyebrows too high. She looked surprised.

How many are unique?

All 5 of these jokes are unique. They are all well-known, classic puns and one-liners, but they are distinct from one another in their setup, punchline, and subject matter. None is a simple rephrasing of another.