We're guessing you're going to spend a lot of time this summer mowing, raking, trimming and gardening in your yards. Nothing wrong with that. It's a great way to bond with the family, improve your curb appeal, and get some much-needed exercise. That is, unless—you guessed it—it kills you. Each year, thousands of us are rushed off to emergency rooms—and morgues—with yard work-related injuries, from missing digits, to freshly mowed feet. Click ahead to learn how that glorious green yard of yours can turn on you in an instant.