I state a scenario and a question, you guys can ask yes/no questions in order to ascertain the answer to the question. Here we go…
Five men were proceeding together down a country path. It began to rain. Four of the men quickened their step and began to walk faster. The fifth man made no effort to move any faster. However, he remained dry and the other four got wet. They all arrived at their destination together. How could this be so?
Edit: Since Black Swan solved that so quickly, here’s an alternative:
A man lives in the penthouse of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. Upon his return, however, he can only travel halfway up in the lift and has to walk the rest of the way - unless it’s raining. What is the explanation for this?