I know there is a /justrolledintotheshop already but we need an Oppo version, our own horror stories of things we've seen done to cars or NOT done to cars. Or things our younger selves have done to cars either unknowingly or deliberately.
I'll go first.
I may have installed some brake pads backwards once - as in metal to metal. It however did not take long to figure out my mistake, maybe 2 feet or motion or less?