Sowcarpettai doesn't manage to be frightening for a horror movie. It’s one of those low-budget films trying to capitalize on what’s popular, using obvious visual effects, an excessively loud musical score, and costumes and makeup that make the characters look like they wandered in from a Halloween get-together. The story begins with Vetri (Srikanth) and Maya (Lakshmi Rai), who are about to be married, being killed…