I have had people go into an uncontrollable rage when I told them the answer to this lateral thinking puzzle:
A man is standing on the side of a cliff, looking out at the sea. He has a small stone with him. He then drops the stone into the water. Moments later, he feels a sense of deep relief and calm.
He is safe. There are no other people around, he is not suicidal, and the stone did not hit anyone. Why did dropping the stone make him feel safe?