Saw series co-creators James Wan and Leigh Whannell make a limp attempt to cash in on the success of Paranormal Activity by teaming with that film's mastermind, Oren Peli, for Insidious, a haunted house film so slick and empty-headed that it may as well come sporting a fauxhawk. A clear-cut case of style over substance, this wannabe spook-a-blast does more