Question:
A man is playing a keyboard.

What is a sentence that would be (on a scale from 0 to 5) a 0 out of 5 in terms of textual similarity to the above sentence?

Answer:
A man is riding a horse.

Question:
Malaysia Airlines plane crashes on Ukraine-Russia border

What is a sentence that would be (on a scale from 0 to 5) a 4 out of 5 in terms of textual similarity to the above sentence?

Answer:
Crash of Malaysia Airlines Flight MH17 in Eastern Ukraine

Question:
Why are they looking at each other like that ?!?!

What is a sentence that would be (on a scale from 0 to 5) a 3 out of 5 in terms of textual similarity to the above sentence?

Answer:
They're looking at each other!