A giant water slide in the heart of Bristol, England is the brain child of artist Luke Jerram, previously known for his street pianos project. Some may recall that Grand Rapids, Michigan did a similar project in 2010spearheaded by Rob Bliss, who went on to produce the famous Grand Rapids Lip Dub in 2011.
Bristol Story: http://www.citylab.com/design/2014/05/plan-turn-steep-street-giant-water-slide-was-huge-success/9039/