Risky investments, those where you're as likely to lose your shirt as score big gains, make many investors cringe. Along with the risk of devastating loss comes the possibility (albeit a pretty small possibility) of staggering returns, and profits beyond your wildest dreams. There are quite a few ways to score such big returns, though each comes with its own unique risk characteristics, including the chance of losing more than you invested!. Are you willing to risk it all for the chance of spectacular gains?