"The Uninvited" - Anna Rydell returns home to her sister (and best friend) Alex after a stint in a mental hospital, though her recovery is jeopardized thanks to her cruel stepmother, aloof father, and the presence of a ghost in their home. Image and info credit: IMDb.
This one is just bloody terrifying full stop. Monsters hiding in closets or under the bed are a thing of nightmares for most kids. A skeletal type monster with crazy hair would definitely terrify me as child.