Oops

Today I learnt, that when parked on a severely steep hill, always put the car into gear.
I was on my coffee girl travels, parked on my customer's drive and called in to see them. Catch up and cup of coffee later I left. When I went to where I'd left my car, found it had slid down the hill! Thankfully it has been halted by a wall covered with a thick fence.
My heart sank as to what damage I would see when I was brave enough to look. Luckily only a smashed light.
Could've been a whole lot worse, but it's only a car and can be fixed.