My first job out of high school was working for the water company. One day I was the last one leaving the job site and it was my job to take a 18 foot long piece of 12 inch pipe (the blue plastic/fiberglass stuff) back to the shop. Well, one of the other guys put the thing on the back of the truck and I figured he had cinched it down. Wrong. All was fine until I turned the corner........I remember seeing the pipe go sliding in the rear view, and the next thing I know it slams into a car's open door on the side of the road. So I get out and find out I've just hit an undercover cop car. The cop was cool as hell about it, but holy piss was I embarrassed. And not checking my load.....that was a dumb idea.