“Monster Party” (*1/2 out of four) was a gory mess about three none-too-bright teenage thieves (Sam Strike, Virginia Gardner, and Brandon Micheal Hall) who infiltrate a mansion dinner party hosted by an elite serial killer cult (Julian McMahon, Robin Tunney, and others) and try to escape before they become part of their victims list. Tunney and McMahon are amusingly cast as the cult leaders but film becomes off-puttingly weird and stupid and extremely bloody. Party elsewhere, you’ll be much better off.