Quack-O-Coaster
From TowersStreet Wiki
The Quack-O-Coaster was a world first roller coaster invented by acclaimed designer John Duckley. It was the first roller coaster in the world that ducks were able to ride, and works by having their plastic genital area scraped along the track somehow.
The first of it's kind can be found on the famous Bubbleworks ride at Chessington World of Adventures, known as the 'Duck N' Dive Revitaliser' for some reason. The ride's location was previously home to the 'Cola Coaster', a much more sensible type of coaster. This however was removed to make way for the new Quack-O-Coaster when Professor Burp emmigrated to New Zealand and his factory infested by plastic ducks.