Snakebit - I get ya!
Very similar experience for me but Mower related - I ordered and replaced a starter on my commercial mower which I had been doing the screwdriver jump starter thing for a while. When I replaced the starter it still wouldn't start so took it to the dealer and when he sat on the seat and it started I almost passed out! I had been standing beside it for so long starting it I forgot. He was nice and it was no charge but I bet he still tells that story!