Yes. I agree. But the scenario under which this happened is acceptable.
The parking spot itself was on a heavy slope. And we wanted to get the boot as close to the wall behind it due to various amounts of expensive goods in the boot. In South Africa this is needed.
We slowly allowed the car to roll backwards until I saw an empending rock on the right back wheel yelling to my dad to stop. He stopped and to our surpise found the back bumper to be a few cm from the wall. My father only drives this car maybe once a week at max and has not driven it for months before this with exception of the one or two spirited drives he has had on his own.
Hence why I posted this to remind those drivers that have forgotten about this.
Mike