Gloucestershire Cheese-Rolling: a hundreds-of-year-old sporting event held on a cliff hill behind the hamlet of Brockworth in the Cotswolds. Now such a huge event (probably due to the viral popularity of this video) that it was cancelled last year due to the huge mobs of spectators trying to crowd onto the hill.
Roll one cheese down an impossibly steep hill one second before a cascade of neck-risking lunatics pursue it. Wikipedia attempts to explain. Tip o’ the hat to daughter for pointing this out.