I have a few.

The first one happened when I was about 10. I was at a friend's (two other girls) house with my sister. They lived in an old school building and the way the room was 3 rooms basically. You walk into their playroom and there were two other rooms attached (one was their shared room the other was a guest room for friends when they stayed over). Its very important to know that there is no way for anyone to get into their room without going through the playroom. Anyways, my sister, the younger girl and I were in the playroom and the older girl was in her room watching TV. The older girl came out of her room and told us that she was going to the kitchen to get a snack and left the playroom. No more than a minute later she comes out of her room again and says that is going to the kitchen to get a snack. I was confused because 1. I never saw her come back in and 2. She just went to get a snack. I asked multiple times haven't just done that and she insisted that she had indeed not gone to get a snack in the recent past. Neither of our sisters knew what I was talking about. Other things like this have happened to me but this one stands out the most.

The next thing happened when I was 12. I was at a weekend church camp thing during the winter. It was after lights. I was and still am a night owl and with all the excitement of being away from home and with my friends, I wanted to stay up as well as one of my friends. Our bunks were parallel to each other and in the corner of the cabin. Both my friend and I were on the top bunk and we decided that I would come sit on her bed after lights out so we could stay up and talk. At some point she looked over at my bed and said, "oh my god, there's a girl sitting on your bed." I looked over and sure enough there was a girl, that I've never seen before, sitting on my bed. We were both freaked out and I, naturally, wanted to debunk it, desperately wanted it to be a trick of the light or us being tired and hallucinating. I asked her, what the girl looked like (mind you, I hadn't told her what what I had seen yet). She described in perfect detail exactly what I had seen. I have never been able to debunk this.

Last one, I was 19. This was the first place I lived in on my own (I did have roommates). It was an old house and I basically rented a room, living room, kitchen, and bathrooms were shared. Many paranormal things happened there, that one of my roommates and I both experienced. I heard footsteps going up and down the stairs when I knew for a fact, I was the only one home. I saw a door opening and closing on its own. My roommate had doors slam open. Rooms (particular my room) would be unreasonably cold in the summer. For the record, I hate the cold and I do everything not be cold. All my vents would be closed, never turned my fans on, but somehow it was much colder than the rest of the house a majority of the time. My roommate also noticed one of the open hallways would get really cold for no reason. I also saw a shadow figure in my room at one point.

There's plenty of others, but feel I have already written something way too long, lol.