Psychological test

Here’s a riddle for you:
It is a story about a girl. While at the funeral of her own mother,she met this guy whom she did not know. She thought this guy was amazing, he was her dream guy, and she fell in love with him there but never asked for his number and could not find him.

A few days later the girl killed her own sister.

Question: What is her motive in killing her sister?

Give this some thought for a while before you click more to see the answer.

Answer: She was hoping that the guy would appear at this 2nd funeral, again.

If you answered this correctly, you think like a psychopath. This was a test by a famous American psychologist used to test if one has the same mentality as a killer. Many arrested serial killers took part in this test and answered it correctly.

PS.
I received this in an email, and I have no idea whether the information above is true. But it’s a cool test.

PPS.
I didn’t get it, and neither did my girlfriend – thank god!