I think I can see one possibility, through a ground loop. Often see systems with multiple major ground points, in multiple places. There's more than 0 volts potential between those ground points even on a factory fresh setup, and only gets worse as rust & other corrosion gets in the way. From what I've understood, the systems are generally designed & tested to be tolerant of these somewhat floating ground levels (another post below talks about the testing). Under admittedly rare conditions I could see an unpowered but still-grounded device being caught in the welding loop path and seeing voltage potentials beyond 12-14V, and/or in a reverse voltage configuration. This also fits with the rule of thumb that, if you have to weld on a newer vehicle, keep a good welding ground point as close as possible to weld point - it would help keep the welding loop as small as possible. Like others, have never had a problem but the cost of diagnosing and replacing the black boxes keeps the pucker factor there.
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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