This is a nice toy to beat the summer heat, that even airsoft players who are at the receiving end may just welcome its shower of water on them. Reported by Kotaku Japan, this is a Marudai RPG-7 PET Bottle Launcher. Just fill a plastic bottle with water, use a bicycle pump to put air in the launcher, and you're ready for some wet game. Only recommended for adults, it costs US$363 (blame it on the strong Japanese Yen), shipping and cute Japanese girls in bikinis not included in the price.

Thanks to Hiro for the link above and to know more, just go to the Marudai Corp. website.