You BETTER WATCH OUT, all right, because Chris Peckover’s holiday anti-cheer horror film, which just played Montreal’s Fantasia festival ahead of its U.S. theatrical/digital debut October 6, will surprise and scare you for the entirety of its running time. This is no simplistic SILENT NIGHT, DEADLY NIGHT-style slasher flick, but a very clever and consistently suspenseful film that announces Peckover (whose previous genre outing, UNDOCUMENTED, explored a very different milieu) as a crafty and assured talent.