person A: A while back_comma_ someone who was a good friend accused me of a crime that I didn't commit.
person B: Why would they do that?
person A: It comes out that she had a multiple personality disorder_comma_ and sometimes that makes her believe things that didn't happen did.
person B: I know someone with that. She might need some medication.
person A: That or some therapy.  Luckily I had plenty of witnesses against her.