A possessed tree and an awfully scary clown paled in comparison to a little girl's convo with a television that replied with static. The late Heather O'Rourke's girlishly gleeful "They're here" is one of horror's most iconic moments. Three decades later, our own obsession with the boob tube hasn't waned. When it comes to terror, sometimes the devil wears a blue dress, er, nightgown.