It was an 80s kid special or show. I rented it from the library as a kids. It had a man in overalls and had a large boom box. He was pretending to be a kid and was in a bedroom where the walls were black and white drawings of furniture, shelves, closets, etc. a voice would yell “don’t look in the closet!” A giant pair of legs and shoes came into the room and I believe he sang a song about bullying.