There's the story of the guy that strapped a large number of helium filled balloons to a lawn chair [1], just because he always wanted to fly. The modern variation today is strapping a large number of drones to a lawn chair [2], just because he always wanted to fly (link via Instapundit [3]).
Neither variation appears safe.
[1] https://en.wikipedia.org/wiki/Larry_Walters
[2] http://www.rt.com/uk/314394-man-builds-helicopter-drones/