My own experiences (long read if interested)
I am convinced there are supernatural things even if they're aren't actually ghosts. I never did drugs in my life, nor am I a religious person. Also my story takes place over years, involving literally hundreds of people and began even before I was born.
My grandma's house was well over 100 years old and was considered by many people to be "haunted." Now haunted by what, who knows and do we even really know what that word means. Since before I was born and over the course of my grandma's entire 50+ years of living in this home, people including me have experienced unusual things. I will try to run down the many occurences over those years experienced by family members, friends, neighbors, mailmen, and god knows who else.
-not only would dogs bark at the air, they would growl at it. it is very freaky watching a dog stare blankly down a hallway or at the end of your bed and start barking at something, then get into an attack pose and growl at air...this was multiple dogs over 50 years so it's not like one was nuts. at the very least we could say some kind of energy existed to screw with their senses. we also had many cats which did hiss at air as well but they seemed to like to hide a lot...so it's hard to judge their behaviors as much as a dog that sticks by humans.
-faces in the attic. before people started thinking the house was haunted, the police were called to the house two or three times because they thought it was being burglarized. when my grandma first moved into the house in the 50s she had a nosy neighbor that watched her house like a hawk and in those early years claimed she always saw someone staring out from the attic. The first couple times led to her thinking it was a break-in. this was also confirmed by family members and the mailman seeing as they saw "a man" in the attic window. Many times people would think someone was home only to realize everyone was out. One of the weirdest tales was my dad, when first dating my mom, when he came to pick her up that was the first thing he said about the house...that he asked what was someone doing just staring out the attic window.
-multiple people said they felt a "presence" in the house before even knowing the history of the home. Many family members and friends refused to step foot in the house due to as they said "a sense of someone watching". Even I have felt this. As you walk through the house you always have that feeling you get when someone is sneaking up behind you. It is a very edgy feel and not something you like to feel 24/7 while staying in the house. Some people obviously didn't feel it so I'll leave it up to interpretation. I will say, even random strangers said this including jehovah's witness people that my grandma would let in from time to time. It's hard to explain but it is a claustrophobic sensation that you feel boxed in and "watched."
-many, many people reported a "phantom cat". I even saw this thing before. It is actually one of the hardest things to explain to people. Physically you don't really see anything as much as it your mind fills in it's visible shape. The only way I can explain it is that it moves and walks around but your mind has trouble grasping what it is seeing. Some people have talked about seeing cats and mistaking them for the actual cats. I know I freaked out one time I saw this thing run into the cupboard and I was calling to it only for the real cat to come out from the other room. Freaky! One neighbor actually claims to have been attacked by the cat and refused to ever go in the house again. She said she thought she was about to pet the real cat and then this thing "lunged" at her and went through her body. Now this is her story, not mine so take it with a grain of salt. But it is of note that it's not like everyone talks about these stories openly so the fact she even brough up a cat is strange considering all the other people's reports. For those who may think we just couldn't keep track of our own cats, this also occurred at points of time when we only had dogs or no pets at all.
-We actually used to joke about nobody going up the stairs because so many people have fallen down them. Many claimed they were pushed. I myself took a tumble down the stairs myself. Suffice to say, about 85% of all people who ever stayed long enough in the house to go up and down the stairs slipped, tripped, or claimed to be pushed down the stairs. Maybe we're the clumsiest people in the world, or maybe the stairs were designed weird. You make up your own mind. We felt it strange considering all the other factors. Plus it was almost like a rite of passage. If you stayed there long enough, you got your "push." This was a consistent event all 50+ years. It's also of note no one ever actually got hurt...something odd even if it weren't ghosts. How so many people share the same accident and never get hurt? Maybe ghosts were screwing with us or some kind of energy field...I have no idea. I just think it was not a coincidence due to the many times it happened. Actually a side note is that the only bathroom in the house was upstairs, and some time in the 90s my grandma grew so fearful of being pushed at her age she had a bathroom/shower built downstairs. She was only fickle about ghosts, she seemed to never be phased although she claims a ghost broke her arm. She did have her arm broken from a fall, but maybe she hallucinated the being pushed part. That's what you have to decide for yourself.
-little kids that stayed over, or the many grandkids and cousins would claim to talk to people not there. Even my sister when she was little would always claim she saw a man and would say hi to him. Now kids are known to be weird and have imaginary friends, but multiple kids over 50 years? Too coincidental for me. I will say I never saw an actual person in my times there though. Although one time when I slept over I swear I saw a man's face in my bed. I was only like 7 or 8 at the time but it freaked my out! Was I just imagining things? Maybe, but I never had another experience like that ever again in my life.
-now this is one of the creepiest to most people. My grandma some time in the 90s had a santa claus head that played music. It sounds creepier than it actually was, but the point is that you hang it on the christmas tree and it has a motion senser that goes off and plays music. Now this thing, would be playing all the time! And I'm not saying it played constantly because of a glitch...I mean, you'd be sitting out in the living room, no one around, and bam, it goes off. Or, it's the middle of the night, everyone's asleep and then it goes off. Now this thing was hanging high, so the pets would not be caught in the senser. It was later hung from the ceiling because my grandma actually began to get a sorta twisted kick out of the creepiness. So to be honest, to be caught in the motion senser, something would have to be at least 5-7 feet high. This thing freaked people out! The batteries were changed many, many times over the years as my grandma would not get rid of the damned thing! I really have no idea why she got such a sadistic kick out of people being freaked out by it. Now maybe it was just really screwed up and the senser was out of whack from the get go. You decide. I will just say there was absolutely no consistency on when it would go off. It did work normally though. If you wave your hand in front of it, it went off. But it was always going off when there is nothing to trigger it...at least visible to human eyes.
-The most common occurence in the house was weird noises and things moving. Now as I said, it's an old house and it's gonna make noises. But some things are above and beyond some creaks. I'm talking door knobs rattling and not gently, violent rattles. Also like rufflings especiially bags. Back in the day of paper bags instead of plastic, you'd see those things always ruffling like something is rubbing against them. If it were just wind it would create a flapping noise, but we'd hear a brushing noise of direct contact. This is also assuming there were even random drafts which there weren't. I'm sure many would brush it off to wind or whatever but I assure you we'd feel wind. And it wasn't air ducts either as my grandma didn't have a/c and she'd only have the heat on in the winter; which by the way, she didn't even have heat until the 60s I believe. I know when she moved in it was only a chimney/fireplace. These things were consistent all year round. Then there's just random bangs, bumbs and other things that are so loud they'd have to come from something breaking or falling but then we'd never find a source of the sound. I mean most of this may sound mundane but not when it goes on for years on top of all the other incidents! Imagine just relaxing and watching a movie only to hear what sounds like a pot or pan falling. Then going to the kitchen to see nothing out of the ordinary. Or imagine you're trying to sleep and then you hear your door knob rattling like someone is trying to get in your room.
-Also many people said to hear voices. Again you can chalk some up to imagining things but many people would claim someone was calling to them only to find no one. I remember the only time I ever ran out of that house was when I heard my mom calling my name. So I went downstairs to find nobody in the house...I was all alone. I decided it was time I spent the rest of the day over my friend's house! Some people claimed to have very brief conversations even. Like, they said someone would call their name. They would answer something like "what do you want" and they'd get back something along the lines of "come here." It is kinda disturbing.
-The last thing I can think of is just the typical shadows other people report. Now obviously these may be imagined many times or misunderstood. But there were many instances where someone would claim they saw shadows moving in their room or shadows that are like a person and would move away only to find nobody around. I mean it is hard to really explain it to someone who will probably brush it off and not believe anyone saw anything but this is many people over a long period of time.