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http://www.imdb.com/title/tt0071186/
Made for TV movie
Bad Ronald tells the story of a teenager (Ronald) who accidentally kills a neighbor girl for teasing him. Knowing that the police will be on their way, Ronald's even creepier mother concocts a brilliant plan. Board up the first floor bathroom, and hide Ronald in there for several months. Unfortunately, Ronald's mother passes away, leaving Ronald on his own, and when a new family moves into the house, they are completely unaware that Ronald is watching and waiting to terrorize them.
Here is a scene from Bad Ronald:
http://www.youtube.com/watch?v=tyY5lmEJH2U
I enjoyed Bad Ronald a lot, got totally wrapped up in the story and was dying to see how it would all play out. And you have to admit, the idea of a fantasy mad high school geek peeking at you through the walls is enough to give you the creeps. Not one for those with short attention spans, but if you're in a nostalgic mood give it a watch.