An old story is told about a big ship whose engine had failed. The ship’s owners called in one expert after another, but none of them knew how to fix the engine.

Then they brought in an old man who had been fixing ships since he was a teenager. The old man lugged a large and worn leather bag of tools with him. He arrived and immediately went to work. He inspected the engine very carefully, top to bottom.

The ship’s owners stood there, tracking the old man’s movements, doubting he knew what he was doing. After looking things over, the old man reached into his bag and pulled out a small hammer. He gently tapped something in the engine.

Instantly, the engine lurched to life. He carefully put his hammer away, tipped his hat at the ship owners and walked away. A week later, the ship owners received a bill from the old man for one million shillings.

“What?!” the owners exclaimed. “It’s ridiculous! He hardly did anything!” So they wrote the old man a note saying, “Please send us an itemised bill.”

Read the full story here.