There was this old nerf product, basically a pistol style Nerf arrow launcher. You pulled back this plunger on the back to pull in air, and then push the trigger to send the air and the foam arrow flying. Now, My Brothers and I each got one, and we found out that if you left the arrow off and stuck the part that sucks in the air under water, it became a squirtgun that packed a nasty punch. That thing HURT when it hit you with water...