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I'd wonder who jumped it, if you reverse the polarity a whole bunch of funny things can happen from not starting, blowing the main fuse, to blowing individual computers or the radio.
most auto parts stores will test batteries for free hoping you'll buy one? But simple test to see if it was jumped backwards put a bolt meter on if you see "-12.8" or whatever VoLTE is in there they jumped backwards.

but as far as this don't use a car and booster cables, if you know what your doing there's no harm to be done, yes it's a rush of amps and VoLTS but no more (generally) then your own car would produce itself, and it goes to the battery which is fuse protected from the car.
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