It’s like the joke about the mechanic who fixes a car’s engine by hitting it once with a hammer. He charges the owner $200 and the guy complains: “All you did was hit the engine with a hammer, I’m not paying $200 for that.” So the mechanic gives him an itemized bill: Hitting the engine with a hammer, $5; Knowing where to hit it: $195.
It’s like the joke about the mechanic who fixes a car’s engine by hitting it once with a hammer. He charges the owner $200 and the guy complains: “All you did was hit the engine with a hammer, I’m not paying $200 for that.” So the mechanic gives him an itemized bill: Hitting the engine with a hammer, $5; Knowing where to hit it: $195.