Here's a test I was sent. Reader, see if you can pass it:
Susan, while attending the wake of her mother in the funeral home, met a man there whom she (Susan) didn't know about and never had met. The man fascinated Susan to the point that she thought she was quickly falling in love with him. Unfortunately, she forgot to ask his name, phone number, etc., and after a while he left without her knowing it, and he never returned to the funeral. A few days later, Susan murdered her own sister.
Why did Susan murder her sister?