Every day, shortly before nine o’clock, a man with a red hat stands in a square and begins to wave his cap around wildly. After five minutes he disappears.
One day, a policeman comes up to him and asks: “What are you doing?”
“I’m keeping the giraffes away.”
“But there aren’t any giraffes here.”
“Well, I must be doing a good job then.”
– taken from Rolf Dobelli’s book ‘The art of thinking clearly’