Riddle: A woman is sitting in her hotel room when there is a knock on the door. She opens it to a man whom she has never seen before. The man says, "Sorry, I thought this was my room." He then turns and walks down the hallway to the elevator. The woman walks back into the room and calls security. Why?
Answer: Because you don't knock on the door of your own room.
Riddle: A woman is at her mother's funeral when she meets the man of her dreams, but she doesn't get his name or number. No one knows who the man is. Three days later, the woman kills her own sister. Why?
Answer: To see if the man would come to her sister's funeral. If you guessed this, you have the mind of a psychopath.