killer instinct

My officemate told us a story with a question afterwards, she said “There  was an accident where the parents of two sisters got killed. A night before the burial, there came a man who the two sisters fell inlove with from the first moment they lay their eyes on him. But on the burial day, they have never seen the mysterious man again. The youngest sister so into him that she wants to see him again. The question is how? If you are the younger sister, what would you do??”

If you answered “Kill the elder sister so you can see him again and have him in your life.” Then you absolutely have a killer instinct within you. This situation actually asks a lot in psychology patients and it was found out that all killers have the same answer as above. What about you?? what did you answer?