My Father's Story - Confusing A Skeptic

This story is not my own. It is my father's, who I believe to be credible.

I am an atheist/skeptic (hold the preaching, it's not what this site is for) and I've spent a while debunking nearly every ghost story I've heard or read simply with very obvious real world examples. For example, if you wake up paralyzed and see things during this, it's not a ghost. It's a recognized sleep disorder called sleep paralysis where you are awake, but your brain is still in REM sleep. Another example: shadow people were debunked years ago using high electric fields. If you see these, don't scream ghost. Test the field. It will be high enough to induce hallucinations and feelings of dread 80% of the time. But I could not debunk my father's story. And the more I try too, the more interested and confused I get. Here is the story - I have not changed or embellished in anyway. This is the exact story my father told me:

This happened 30 years ago when my father was in his twenties. He was dating a woman named Becky, who was very interested in the paranormal. One night, they got a Ouija board (yes, I know there are hundreds of these stories, but bear with me here please. It's what happens after that I need help explaining) and went to the second story of Becky's house. She was very excited about it and my father did not think that anything could possibly go wrong, as he was a skeptic. They lit candles and began to ask questions. After a half an hour, the glass they were using began to finally move. It just spoke random words and numbers and Becky began to tease it, thinking that it was messing with them. They got bored and left the room, at which time they witnessed the board and the glass be thrown into the wall. The glass, of course, broke. To my knowledge, they did not close the conversation.

My father left to go home and said he could feel something in the car with him. He could see nothing, just had this heavy, terrifying feeling that there was something with him (since he was in a car, I could find no reason why he could feel this for five miles. Anything earthly wouldn't span that far). He went home and sat in the living room, trying to calm himself down. My grandparent's house he was still living in is tiny. You can see every door in the house from sitting on the sofa. He said that he could hear every door slamming through the house, but no doors were really moving. There were heavy footsteps running everywhere. And he said that the feeling of fear was like nothing he has ever felt before.

Becky was experiencing the same thing. Upstairs in her home, you could hear heavy footsteps and doors slamming, like something huge was running around, throwing a fit. She had that same feeling of deep fear.

My dad went back to her house the next day, knowing that they had made a mistake. They sat in the living room, discussing what to do when they heard someone walking down the stairs. It turned the corner and walked to them, but nothing was there. Then my dad felt a huge hand on his shoulder. He said the fingers hit him mid chest and he could see the indent in his shirt but he couldn't see what was doing it. Later that night, Becky was thrown from her bed. My dad said there was a huge hand print on her thigh.

They decided to try the board again, trying to get the activity to stop. They were terrified. They didn't get a name or anything from the board. Nothing happened. Finally, they asked it what it wanted. It spelled out a row of numbers. My dad didn't realize until he walked out to his car that night that it had spelled out the plate number to his car.

At night, he could feel it in his room. He says he only saw it once, a huge black shadow that seemed to just stare at him. This went on for about a week- being followed, footsteps, fear. They ended up burning the board out of desperation and my dad said that most of the activity stopped. He says though, that even 30 years later, he can still feel it sometimes. He'll wake up horrified and be unable to move out of fear. And he will stay there, too scared to look around or get out of bed, until morning. It happened to him after he told me this story a few weeks ago after I asked him if he believed in anything.

He doesn't tell this story to anyone because he is still scared after so many years. He also knows that people won't believe him. I only believe him because it's my father and he is a very honest man.

I pride myself on being a logical person. I can't make logic explain this at all. Is there a single Earthly explanation for this? Bits and pieces of it, I can try to explain. But all together, I'm at a loss.