I got one:
Many years ago when i was about 13 or 14, me and one of my mates came across one of those old battery operated milk floats (fully loaded with milk + eggs) parked on the steep hill around the corner from where my parents live.
So my mate started pissing about shaking the back end of the float, and i noticed that every time he shook it was rolling a bit.I told him but he did'nt believe me, so i gave it a shake to show him. "If i did"
Next thing i knew the milk floats brakes released and and it started to roll.
At first i stupidly tried to hold the weight on the steep hill, but soon realized if i did'nt get out of the way of this run away milk float i was gonna die!! as i was hanging off the end of it as it started picking up speed down the hill.So i let it go and dived out of the way to safety.
The Inevitable happened. The milk float rolled about 20 meters down the hill turning off to the side as it rolled.Seconds later it slammed backwards into a solid concrete lampost, rusulting in catastrophic damage to the rear of the milk float, and at least 100 pints of milk and 50 dozen eggs smashed all over the round
It turned out the milkman was doing a delivery opposite.He came running out the garden like Forest Gump!!, and after compossing him self he frog marched me and my mate down to our parents house looking for compensation for his damaged vehicle and loss of pretty much all his stock.
We got into alot of trouble over that!! !!