“Siren” (*1/2 out of four) was a schlock horror thriller set at a bachelor party in which the groomsmen unleash a fabled predator on the festivities which leads to chaos and a long night of screaming and murder. Inspired by the segment “Amateur Night” from the 2012 horror anthology “V/H/S” and the title is ironic given the movie is strictly amateur night in terms of acting and filmmaking. Inspire yourself to pick up a better horror movie instead.