‘Serial Mom’

John Waters’ latest, and one of his best, is like an early ‘60s TV sitcom that keeps lunging into profane naughtiness. Waters builds our disbelief of shows like “Leave It to Beaver” and “Ozzie & Harriet” right into the movie. He also builds into his movie the no-brained affection we have for these shows, but in the meantime there’s the real world of serial murders and mania to contend with. Waters’ conceit in “Serial Mom” is to give us a June Cleaver type--Kathleen Turner’s furiously funny suburban Baltimore homemaker Beverly Sutphin (pictured)--who is also a serial murder on the sly. Her rampages are almost always in defense of her family; she’s a valiant fantasy mom, the kind of Mother Courage who will impale her daughter’s no-good boyfriend with a lance and leave his liver flapping (Cinemax Monday at 9:30 p.m.; early Saturday at 2:30 a.m.).