Camera shaped trick squirt gun from 1904!
On February 2, 1904, Morris A. Heimann received a patent for trick squirt gun.
The gun looks like a photography camera from outside.
So you can have someone pose for a photograph, but spray water on them using this gun. Luckily you get this even now. Many squirt camera guns are available on ebay – http://www.ebay.com/bhp/squirt-camera.
Patent Information
Publication number: US750853 A
Patent Title: Squirt-gun
Publication type: Grant
Publication date: 2 Feb 1904
Filing date: 22 Jun 1903
Inventors: Morris A. Heimann