I remember watching this back in the early/mid 80s. A boy thinks there is a monster in his closet, and of course nobody ever believes him. I don't remember much else besides the ending to the movie. The boy goes to bed and suddenly a light comes on in the closet. The door opens and a monster is standing there. It grabs the boy's ankle, drags him into the closet, and shuts the door, and the light goes off. Credits roll, end of movie. Does anyone remember this movie?

I was only 4 or 5 years old, when I saw it, so I don't remember it very well. I just remember being scared shitless after that ending. For many months afterwards, every night before going to bed, I would push my dresser and some other things in front of the closet, so the monster couldn't get out.

Could be either...
Monster in the Closet
or
Cameron's Closet

http://www.imdb.com/title/tt0091544/
http://www.imdb.com/title/tt0097008/

Hehe. I remember when they closed Orange Circle (in Orange, CA) to film Monster in the Closet, I wandered around the set and security tossed me out.