The telephone has a sordid history in cinema, dating back to Dial M for Murder and even earlier, and creepy callers were the subject of a previous FEARnet feature (if you missed it, be sure to check it out here). As we all know, any time the phone rings in a horror film, you can be sure that it’s Satan on the line. Part of what makes telephone calls in horror films so frightening is that the viewer typically cannot see who's tormenting the film’s protagonist. It’s the same basic idea as the unseen perpetrator; we fear that which we cannot see. Therefore, the telephone has been used for many a game of cat and mouse... and to terrify countless babysitters. In honor of one of the most nefarious tools of terror horror cinema has to offer, we count down eight of the most terrifying phone calls in horror.