I just lifted this from the following link:
Quiz: Are you a sociopath?
If you have seen this don't answer please. Don't google it. Just try and answer. There is no wrong or right answer.
Here is the question.
A woman is at her mother's funeral. There she meets a man, who is a friend of the family but she doesn't personally know. She is captivated by him but he leaves without her getting his name.
The next day she kills her sister. Why?