The Gate (1987)

After Glen has a bizarre nightmare, he is awaken by the sound of drilling outside his window, and sees men cutting down a tree that is in the backyard. As the workers take the tree away, Glen discovers a fragment of a geode. Later, along with his friend Terry, he digs up the yard and they find a larger geode. When his parents leave for three days, Glen's older sister Alexandra "Al" insists she's old enough to be in charge. So while Al has a party downstairs, Glen and his friend Terry hang out in his room and the geode suddenly opens up. Not long after, weird things start happening; Glen is levitated at the party, Angus, Glen's dog mysteriously dies. Terry shows him a heavy metal record album with lyrics that are based on "The Dark Book", that can summon demons and open the gate, and Terry believes that they have accidentally opened it. It's the battle of good against evil in this fun cult horror classic. Starring Stephen Dorff, Louis Tripp, Christa Denton, Kelly Rowan 7/10