“The Night They Knocked” (*1/2 out of four) was a blah, by-the-numbers horror show about a group of friends (Jack Buckley, Linnea Craig, Deirdre Kozcur, and others) staying at a mountain house for the weekend which is suddenly disrupted by (what else?) a savage murderer who knocks on the door in the middle of the night. Writer/director Sean Roberts actually had his cast watch “The Strangers” before production as preparation- and justification- for brazenly ripping that movie off. Even besides that, film is pretty scareless and devoid of style.