Me and my dad was working on his 83' Mercedes, well, he told me to put it in neutral and fire it up and, we had the wheels chocked and thought we wouldent need the E brake so we didn't engage it and, we were all done and, the car is shut off at this point and, we began to unchock the wheels, not realizing that I had the car in neutral, I pulled the last chock and, that car started to roll backwards, I tried to hold it but, I did not want to scratch the paint with the little stones stuck to my hand and could not hold it but, lucially my dad jumped in and saved it. We kind of looked dazed at ourselves after my dad saved it. That car is also my dads pride and joy so it was a good thing nuttin happened to it.