Hey there, I would just like to say I don't particularly believe in "ghosts" but beings we don't know about? Entirely plausible. This occurred almost 6 years ago in my grandparents home in a small town in Alberta, Canada at around 3 or 4 in the afternoon.
My experience happened a little while after I turned 18. I was going through my "what if God isn't real" phase and didn't enjoy spending time with my grandparents much, mostly because they ALWAYS have the Christian channel on in both their bedroom and the tv room. That afternoon had been really boring at the dollar store I was working at, so my boss gave me the rest of the day off. When I got home everyone was next door* with my great grandma, who had been in and out of the hospital for about 3 months. I quickly said hello to everyone, then proceeded to my room.
I had been in my room for about an hour, killing time by practising some simple art renditions*, when out of no where, I hear heavy thumps going down the stairs next to my room and the bathroom door* slamming very hard out of no where. This being said, I ALWAYS kept the bathroom door closed because my grandmothers cat Cuddles liked to go in there and shred my tp. My grandpa was always running to the bathroom as such* so I didn't really think about it until I realized no one had opened the door again to leave the bathroom.
I mustered up what bravery I had and went to check it out. I looked at the bathroom and the door was still closed, I still hadn't heard anything coming from the room so I called next door real quick. When grandma picked up I asked if anyone had come over to use the toilet and she said no, everyone had been in with great grandma for the past hour trying to get her to eat. That right there freaked me out, mostly because I always had the doors to the house locked and bolted. After that I went upstairs to the tv room and watched Benny Hinn. No other experiences happened to me in this side of the house.
*My grandparents own a duplex with them on one side and my great grandparents on the other side. This duplex was built by them and no one else has ever owned or lived in it besides my mother renting it when she was young and I myself, renting it for a year after high school. The land it was built on used to be a large empty field where nothing of any relevance has occurred.
*I am a graphic designer, and yes I have a vivid imagination but I mostly stick to the retro/princessy themed creations... Scary is definitely not me!
*The bathroom is about 5 steps away from my bedroom door, the basement is small with 3 rooms opposite my bedroom, the bathroom being the furthest, and a small kitchen/living room next to my bedroom. All the basement doors are really noisy by the way, since my dad had installed them a few years before (he is blind and diabetic since birth so when he fixes stuff it works, but not perfectly)
*My grandpa has a problem with his esophagus called gastroesophageal reflux disease. This causes him to throw up most of his food due to the lack of movement in his esophagus which is meant to push food down. This means a lot of trips to the bathroom especially after meal time (when everyone has to go).
I would like to find out what this was, especially since the house is blessed top to bottom every spring (this happened in summer, so not long after the blessing had occurred) If anyone has an idea I would love to hear it.