The Xploderz water gun brings all the hurt of a paintball gun, but no mess. Instead, when that pellet tags you, you're greeted with a blast of water. Which probably feels quite refreshing in warm weather.
Ranging in price between $30 and $40 dollars, these guns can project the water pellets up to 85 feet. And oh, pellet refills will cost you $6. [Xploderz via Fancy via Oh Gizmo!]