Riddle: A man went to a party and drank some of the punch. He then left early. Everyone else at the party who drank the punch subsequently died of poisoning.
Why did the man not die? Please note that he did not add the poison. Also, nothing was added to punch after he left.
Answer: There was poison in the ice, but since the guy drank it first, the ice hadn't been melted yet. As the party went on, the ice melted and and the poison was released, and then people died