i actually just worked on some....i forget. but yeah they had aftermarket taillights and i guess a bulb was out so they replaced a brake/turn/parking light with an 1157 (single filament) bulb. when you stepped on the brakes, the parking lamps illuminated along with the brake lights. with the lights on, all the brake lights stayed lit including the third. so yeah replaced it with a dual filament and wala. not as crazy as yours but it was weird.
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