Mystery

A: I don’t know.

B: It’s a mystery.

A: I know this, but why did it happen?

B: It’s a mystery.

A: I know this, but when did it happen?

B: It’s a mystery.

A: I know this, but where did it happen?

B: It’s a mystery.

A: I know this, but how did it happen?

B: It’s a mystery.

A: I know this, but what happened?

B: It’s a mystery.

A: I know all of these, but who did it?

B: It’s a mysterious mystery.