What causes this?

Make DAMN sure you've got the parking brake set and I'd chock the rear wheels, too, before I get under it to check/adjust the shifter.
Never get under a car that is not blocked and on jack stands.

A car rolled onto my dad while moving the shifter under the car. It trapped and killed him before he was found by my mom. I pulled him out and tried desperately to save him doing CPR until the rescue squad arrived.

This car killed 3 people, 2 before I bought it. Mamed one after and burned an apt down. Yes the real "Christine" . A story I hate reliving. The car had less then 200 miles on it. I bought it at an old salvage yard.

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