Read this question, come up with an answer and then scroll down to
the bottom for the result. This is not a trick question. It is as it
reads. No one has gotten it right---including me.

A woman, while at the funeral of her own mother, met this guy whom
she did not know. She thought this guy was amazing, so much her dream
guy she believed him to be just that! She fell in love with him right
there, but never asked for his number and could not find him. A few
days later she killed her sister.

Question: What is her motive in killing her sister?
(Give this some thought before you answer)

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Answer:

She was hoping that the guy would appear at the
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 the test and answered the question correctly.

i have heard this question before on a drama serial before. back then, my answer was that the guy is her sister's boyfriend or something.

taken from here

i've seen this before :S creepy one, i didn't even think of that answer...