Bilateral Thinking Puzzles

Q: There is a man dead in a locked office, sitting at his desk. On the desk there are a couple of pieces of blank paper, a pen and a sealed envelope. What had happened?

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.