A young woman is attending her mother's funeral. While there, she meets a man she has never seen before and falls in love immediately. After the funeral she tries to find him but cannot. Several days later she kills her sister. Why?
Answer:
She killed her sister in hopes that the man would be at the funeral. Some people say this riddle is a test of a psychopath. If you answer it correctly, you could be one.
In the back. See, the train is still accelerating as it is leaving the station so the train will be moving faster when the back of the train enters the tunnel.