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"