You thought Gonzo's flight via balloon cluster in The Muppet Movie (one of my all-time favorite films) was just a joke? Think again:
The most famous cluster balloon flight took place in 1982. Larry Walters, with no prior ballooning experience, attached 42 helium weather balloons to a lawnchair, intending to go up a few hundred feet, but instead soaring to 16,000. Surprisingly, Walters survived his flight.
That part made me laugh. Just imagine some clueless fellow sitting in his lawn chair, suddenly ascending more than three miles into the air.