Keep 'em guessing

Sometimes it's good to keep them guessing.

Eunjoo : I was thinking we could go to a movie.
Me: Yep. But, actually, I'm not really into it.
E: Oh. You've changed.
M: Oh, It's not that, it's just... let's just not go.
E: Why?
M: You don't want to know.
E: I do. What is it?
M: I'm sorry. I just can't tell you.
E: Can't?
M: Won't?
E: Just tell me.
M: No, you'd hate me if I told you.
E: What is it?
M: You'd probably stab me in my sleep.
E: What did you do?
M: I'll never tell you.
E What is it?
M: Don't worry about it, it's nothing. I'm just a little tired.