“Betty’s Revenge” (* out of four) was an insufferable horror dud about a group of college seniors (Samuel J. Bennett, Faith McKinstry, Emma Claire Dykes, and others) who stumble onto the title character Betty (Hannah Fierman) who is a former cabaret owner who has evolved into a sociopathic/psychopathic killer who (yawn) stalks-and-slashes all of them one by one. Full of annoying characters with even more annoying in-your-face acting but even this doesn’t keep the movie from being dull. This “revenge” is preferable to Montezuma’s- but not by much.