The Madagascar Institute is a Brooklyn-based art collective that "that specializes in large-scale sculptures and rides, live performances, and guerilla art events." The artists are especially fond of attaching jet engines to large sculptures and improbable vehicles. Most recently, they made a two-person carousel powered by small jet engines. The action in the above video starts at the 1:23 mark.
Madagascar Institute Website
http://www.popularmechanics.com/home_journal/workshop/4331862.html via Gizmodo