The people of Halifax invented the trampoline. During the Victorian period the tripe-dressers of Halifax stretched tripe across a large wooden frame and jumped up and down on it to `tender and dress' it. The tripoline, as they called it, degenerated into becoming the apparatus for a spectator sport. The people of Halifax also invented the harmonium, a device for castrating pigs during Sunday service.Mike Harding, "The Armchair Anarchist's Almanac"