Short films—and short, as in really, really short films—are in. One-minute, three-minute, six-minute flicks you catch almost exclusively online. And some get more viewers than a censor-certified, two-hour-or-longer feature. The short films come in as many genres—thrillers, romance, comedy, horror, adventure, drama—and not just startups or indies, even the bigger, older production houses are into it.