You can finally add "swimming pools" to your running list of seemingly mundane-but-murderous-pastimes. Recently local authorities in Tampa responded to an emergency call involving five sick children at a local pool. As reported by ABC News and others, a "cloud of chlorine gas" appeared in the Calypso Pool hours after a thunderstorm had caused one of the water pumps to spontaneously switch off. The children were rushed to the hospital after expressing stomach discomfort and nausea. Thankfully, it seems like no one was seriously injured.