A: Why are you using crutches?
B: Can you keep a secret?
A: Of course I can! What happened?
B: I sprained my ankle yesterday.
A: What were you doing?
B: It's kind of a secret.
A: Why is it a secret?
B: I'm a spy, and if I tell you, I'll get in trouble.
A: Do you really expect me to believe that?!
B: Alright, I'll be serious this time.
A: Good. What really happened?
B: I got hurt during my ninja training.