This happened in the same house as in The Basement Dancer. It was 1989 I believe at around 9:30pm-10:00pm and everyone in the house was was already settled in except for my two oldest sisters (13-14) they were getting ready for bed and were the bathroom which had a connecting door to the basement near the toilet. My oldest sister was actually using the restroom while the other was brushing her hair.
Well, as she was doing that she heard a strange noise coming from the basement. (see she was the one that actually told me this story. I was too young to remember anything) She asked my oldest sister if she heard the noise and she said yes. So then she walks over to the basement door and opens it slowly. She peaked her head around the corner to see the most chocking thing that she has ever seen. She told me she saw this person or demon crawling up the stairs like how a baby would, dressed in this clown suit, holding what looked like a knife in his hand. She told me it was like a dwarf because it was smaller then a midget. She gasped and could not move. When she did that it looked up at her with this "freaky" grin then put the knife in its mouth and started up the steps more quickly stumbling and catching its toes on each step because of how short it was. She could still not move but was making a hesitant sound that scared my oldest sister that then grabbed her arm but could not move her as if she was transfixed on the demon by a force.
Just about near the top she then let out a scream. She then told me that the "thing" stopped, stood up on the steps to then laugh at her sounding like a child. Then he fell backwards falling on the steps with dead weight looking like a person with no control of there limbs. She was then pulled into the bathroom with the door shutting hard.
My dad heard the scream and came to the bathroom. They told them what happened and he went downstairs to find what they saw. He could not find anything that resembled what they told him.