3 things that are creepy and I can't really explain.
When I was at college, they did a "ghost night" one night since the building was rumoured to be haunted. Basically it was a massive sleepover for whoever wanted to come and we had mediums and ghost hunting experts came with their equipment. At one point we were in training beauty salon (which had rumours of a little girl haunting it), we were trying to talk to any ghosts there with the equipment. There were no doors or windows open, however, me and the 2 other people I was sat with all felt something cold walk through us. It felt different than a cold draft, it honestly felt like something icey cold walked through the middle of us 3 and we all felt it at the same time.
I was at my friend's house (old terraced house built in 1900's) with my boyfriend. We were sat on the sofa and honest to God, we heard a man laugh behind us. It was a mischievous laugh and it didn't sound like a muffled sound from outside or anything. It was crystal clear, like if a man bent down a little bit from behind us and laughed in our ear.
I was about 10 and I felt unwell one night. I was going to go downstairs to see my mum and I swear, out of the corner of my eye going past the bathroom, I saw a girl sitting on my bath looking into the sink, then looked at me in a scared manner, then went into the wall.