You need two similar sized Very Large Keys (about 6 inches long), each tied to the end of a long length (60 feet or more) coarse string. The keys and string should have spent a few hours in the freezer immediately before being brought out. Line up two teams of about eight to ten. The key must be passed down trousers and dresses and skirts and the string will show the route followed. The winning team is the first to get everyone 'threaded.