A contestant on a Japanese gameshow gets shot over a lake with pressurized water bottles strapped to his back. It looks like they’re all pressurized with bicycle pumps and then released all at the same time. He goes really far and high up in the air, I’m surprised he didn’t get hurt, yikes! The water rockets you can build are fun, not sure launching humans is a good idea, unless it’s for a game show. Link.
Water Bottle Jetpack