Water Wars, from SUCK UK, is a special water gun game that features vests with hydrochromatic inks. It sounds like a great way to stay cool this summer. Every time you get hit, the vest turns red, and if you’re completely “bloody” then you lose the game. The kit comes with two guns and two vests, so you just need to bring a friend to play. Pricing and a release date are unfortunately unavailable right now.