I love that half of the encounters on this thread involve using drugs. That should be a hint.
My whole life, I've had dreams about ghosts. I still do.
Most of the dreams take place in the old house I grew up in and moved out of when I was 12. The majority of those have something to do with the tool room in the back of the basement. When I was young, it always felt like something was in there. It had a very heavy door that we kept locked and if I remember correctly I think it also had a small window.
Once, when I was 10 or 11, I was practicing my drums in the basement. I was the only one home. Out of the corner of my eye, I swear that I saw something move quickly from one end of the basement to the other and into the tool room. The was a loud noise like a door slamming and I ran the fuck upstairs and shut the door behind me. After that, I didn't go back downstairs for weeks. When I started going back down, I would yell things like "I'm not afraid of you" etc.
The dreams I have about that basement are too terrifying to put into words.