jack where

A few weeks back there was an article in the local paper about a guy found dead under a car he was working on in someone else's back yard. He'd been there a few hours. The paper didn't go into details about what he'd been using, but simply said that the car rolled off the jack and landed on his chest. The bottom line is don't get under something held up by just a jack, don't forget to chock your wheels, don't do certain things alone -- even on flat, dry ground. Gravity is pretty unforgiving.