From Japan's company Maruda, the RPG-7 PET Bottle Launcher is a water rocket-propelled grenade launcher which fires water bottles. With a 35º angle, this toy can launch a bottle filled with 0.6L of water up to a distance of 35m (approx. 115ft). Maruda is selling the RPG-7 for ¥28, 350 (~$361 USD). It looks cool!