The Boogeyman (1980)
The most terrifying nightmare of childhood is about to return!
Twenty years after watching in the bedroom mirror as her brother stabbed their mother's abusive boyfriend to death, Lacy returns to the scene of the crime in an attempt to rid herself of the memory. The homecoming is cut short when she is confronted with the dead man's ghost in the very same mirror, prompting her to hurl a chair at the taunting figure in the looking glass. Unbeknownst to Lacy, this spontaneous gesture has freed the angry poltergeist from his glassy tomb, sending him on a bloody rampage in his quest for revenge.