Summer’s here in the northern hemisphere, so why not have some real fun outdoors with this wirelessly controlled water gun? Thanks to Austin Shaf for this brilliant idea, the video above shares briefly about the entire setup alongside a demonstration of it in action. The prankster will need to hold onto a wireless AVR remote, and whenever there is someone within range walking past, said prankster can then activate a second AVR controlling a pump in order to have water spraying around everywhere.