Movie about a guy who gets, somehow, involved with Monsters who live in the catacombs of a graveyard. A society of Monsters who hide. Man starts to become a monster. Over a girl? There was a guy/monster who had a half-moon shaped head. Big chin; big forehead. Didn't care for the new guy hanging around. Guy, I remember, was always wearing a leather jacket. Any help or questions... can't wait to hear from you.