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.
Awesome Post-It Note Art. Artist Don Kenn does amazingly detailed pieces on very tiny canvasses. His Post-It Note masterpieces depict cutely macabre childhood nightmares. If Edward Gorey had access to an Office Max, this would probably be the result.
One of many insane productions off of Skrillex's "Scary Monsters and Nice Sprites" EP, "Rock 'n' Roll (Will Take You to the Mountain" provides a drop that only a genuine dubstepper can truly appreciate.
Scary Monster on the Ceiling This super-creepy monster is deceptively easy to make. Combine a scary mask and old wig, an old night gown, and some wire hangers in a person-shape. Suspend it from the ceiling with fishing line.