Heading off on a tangent...
It might be nonsense, but I was talking to an NRMA (RAC?) bloke once. It was a rainy day and I said, "I bet you guys hate being rostered on in this weather.'
He said the shift they all hate is Sunday afternoon. That's when all the guys who have a go - and fail - at fixing their own car call up because they need the car Monday morning to go to work.
I'm guessing the DIY mechanics get on the phone to book an NRMA visit and just say the car won't start but they don't know why. It wouldn't be till the bloke arrives that it becomes clear the car won't start because there are bits of the motor on the floor of the garage.
ha ha, thats gold !