My first summer home from college I got a job driving a delivery van for a laundry outfit. Went from town to town in New England in this ancient Dodge unit with the engine under my right elbow. The entire van had been shaken by god and then set down again, there were no right angles left, the tires had some tread between the bald spots and the rear doors were held together by faith and some twine. I'm one of the only New Englanders who once found Islington, and my experience with inertia was that as I accelerated a wheeled canvas tub full of clean shirts castered slowly to the rear and then kept going, in the town center. I think it was later the same day that a tire blew but the engine was so shaky I couldn't tell at first.