Here's my personal favorite: I was helping my brother in law pull the drivetrain out of his 88 Suburban to rebuild the engine. He has a flat concrete driveway with a steep hill on the back that goes to a looong sloping yard and meets up with a wooded area at the back. It was late at night, and we were pulling the drivetrain with a cherry picker and it was stuck on something because it was starting to lift the front of the truck. "here it is," I said, "we forgot to unhook the speedo cable." He handed my a pair of lineman's pliers and said to cut it, because it didnt work anyway. When i cut it, the truck bounced, the brick behind the rear wheel moved, and we both watched as the truck went down the enbankment backwards and disappeared into the darkness. A few seconds later we heard the crash as the truck slammed backwards into a tree, destroying both rear doors, bumper, top, and breaking out both side windows. It sat there for three years before he had it hauled away for junk.