Stochastic Consistency Test

Here are 5 jokes:

1. Why don't scientists trust atoms? Because they make up everything.
2. What do you call a fake noodle? An impasta.
3. Parallel lines have so much in common. It’s a shame they’ll never meet.
4. Why did the scarecrow win an award? Because he was outstanding in his field.
5. What’s orange and sounds like a parrot? A carrot.

How many are unique? All 5 jokes are unique.