Bilateral Thinking Puzzles

Q: 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?

A: He climbed on a block of ice which had since melted.

Another

This is another thing that seemed funnier a third of the way into writing it, from the Surrealist. 19th August 2005.