Comment by OrangeMango

> parked overnight on a steep slope facing downwards

I had a car which couldn't be parked that way either! Turned out, the reverse gear on a 1985 Honda Civic with a 4-speed manual was too low - the tiny engine simply didn't have the power to back up uphill. Unless I could guarantee that nobody would parallel park close to my front bumper, the car would be stuck in the parking spot!