Some social trends come and go. Think goldfish swallowing, streaking and dwarf tossing at your favorite neighborhood bar. Other social trends, however, might start out silly, fun or even useful but then morph into something twisted, out-of-control — or even dangerous. A UCLA professor once claimed an adult male could eat up to 150 live goldfish without suffering any bodily harm, but several of the following trends that have gotten out of hand have the power to kill you in an instant.
