That's the name of it! I was trying to remember the name of the movie, especially after reading this.
I thought it looked pretty neat personally, although I have to wonder how secure you can feel in a lawn chair at 10,000 ft attached to balloons. I'd probably have to get one of those with the foot rest so I could prop my feet up...
Not a bad way to get a birds eye view into a ball park. Would have to tie-down somehow. I don't know if I would personally trust a bunch of ballons, myself.
"...Walters had surprised an airline pilot, who radioed the control tower that he had just passed a guy in a lawn chair..." Priceless.