Riddle: A man is killed by a priest from a french missionary. Exactly two days later the funeral is held. At the funeral the mans daughter sees a man who she instantly falls in love with. However, the man disapears before he can get his contact information. The next day she is drinking coffee. After she finished the coffee she kills her sister. Why?
Answer: She deduced that the man was a friend of the family and by killing her sister he would come back to her sister's funeral. This would allow her to get his contact information.