Evilspeak is a 1981 American horror film directed by Eric Weston and co-written by Weston and Joseph Garofalo. The film stars Clint Howard as a outcast cadet named Stanley Coopersmith, who frequently gets tormented by his mates and advisers at a military academy. Upon finding a book of black mass that belonged to the evil medieval Father Esteban, he taps through a computer to conjure Satan and summons spells and demons to get revenge upon his harassers.
The movie was one of the infamous “video nasties” banned in the United Kingdom in the 1980s. Were it banned for sucking I might understand.