Oh yes. And mine involves a car as well. And it was using jacks as well....But I recond most of us, especily us oldes have done some thing daft in our past...
I've had that happen too. The jack under the car I was working on groaned and then the car slumped against the wall. This actually stopped it hitting the ground so was easy enough to jack up again.The car ended up leaning against the wall.