My parent's mailbox is mounted on an L shaped piece of 3 inch rebar that is secured into the ground by concrete. It was like that when they bought the house and always wondered why the mailbox overkill.... See, they live at the junction of a T intersection and one night, a drunk driver failed to turn left or right when he came to the end of the street. 3 inch rebar doesn't bend, so when he hit it, the concrete that the rebar was mounted in uprooted from underground and this guys car was stuck on top of it. It was a little front wheel drive car so when he tried to get unstuck, the front tires (which were no longer in contact with the surface of the earth, but suspended in midair) simply spun ineffectively while the engine revved away. The crash and the whining engine woke us up, along with several of the neighbors and somebody called the cops. My mom felt bad for the guy (because she's too nice for her own good) so she was serving him coffee and donuts when the cops arrested him.