Okay, I can't remember the name of an early 80s film, largely set in a masoleum where young people have secreted themselves on the one year anniversary of a particular inhabitant's entombment... that may not be accurate, but there is a set up where a young couple are locked in and two other young women plot to scare them, complete with masks and drugs... one of these young women is an African-American who spends her entire time on-screen with a toothbrush
in her mouth...! (Memorable, I guess, and somehow charming!)
There is a special occupant of the masoleum, which is the type that houses many tombs, some of which burst open after the special occupant (an occultist and/or illusionist) commands them to from his own tomb (complete with tiny electric shocks shooting from his dead eyes...) coffins slide out, and the mouldering, long-dead occupants animate, open their eyes and come forth...!!
I know this was covered on the old SCIFILM board, but I now can't remember the name but think it a very good Horror film!