Thought you may appreciate this - Haddock and MSea especially, with the nautical flavour!
"A ship engine failed and no one could fix it. Then they brought in a chap with 40 years on the job. He inspected the engine very carefully, top to bottom. After looking things over, the guy reached into his bag and pulled out a small hammer. He gently tapped something. Instantly, the engine lurched into life. The engine was fixed! 7 Days later the owners got his bill for 10k. 'What?!' the owners said 'You hardly did anything. Send us an itemised bill.” the reply simply said
Tapping with a hammer. £2
Knowing where to tap. £9998"