Super Soakers for Firefighters
The Jet Spray concept design for the fire hose of the future looks and acts like a Super Soaker on anabolic steroids. Fire hoses are pretty high-pressure already, but the Jet Spray is an attachment designed to add even more pressure and increase their range by 30 meters. If one were so inclined, one could hose down a gaggle of hippie protesters from a solid 100 feet away, I'd wager.
Fluid dynamics dictates that all you would really have to do is make the nozzle smaller, so all the fancy packaging on the Jet Spray (is that a bazooka-style shoulder brace?) seems a little superfluous. But, it also seems a little awesome.