Stochastic Consistency Test

Here are 5 jokes:

1. Why did the scarecrow win an award? Because he was outstanding in his field.
2. Why don't scientists trust atoms? Because they make up everything.
3. I'm reading a book on anti-gravity. It's impossible to put down.
4. Why did the bicycle fall over? Because it was two-tired.
5. I would tell you a construction joke, but I'm still working on it.

Unique count: All 5 jokes are unique.