Why does TV struggle with being scary?

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http://grantland.com/hollywood-prosp...uality-horror/

Movies can be scary, says Andy Greenwald, but television struggles with fear. "TV, by its very nature, demands a diversity of tone and pitch,” he says. "Viewers simply can’t be asked to hold their breath for eight, 10, or even 22 hours a season. Try it and they’ll be dead even sooner than your show. Instead, TV traditionally has had to play in the margins of horror, building entire series out of the offcuts and scraps usually undervalued by the Fangoria crowd: the slow, agonizing buildup; the stolid, yeomanlike investigation; the long, sorrowful denouement… A scary movie is a turn through a haunted house. A scary TV show is more of a haunted time-share.”