I've been reading your amazing stories and I felt it was time to add mine so here goes. This story will be kind of long so bear with me please. Settle in with your popcorn and enjoy!
The weirdest story that has happened to me so far was when I was around 18. A little back story before I begin though. The house I grew up in (from when I was about 10 until I moved out at 22ish) is in the near western suburbs of Chicago. It was built sometime around the late 1800's and was actually the house my grandmother was born in so it was our family home.
Anyway, like I said I was about 18 or thereabouts and I was up watching TV in the living room late one night. My mother was sleeping (she's the type that can sleep through a plane crash - she actually did when she was a kid growing up near O'Hare Airport). My father was at work (he did overnight security) and my brother was out doing whatever it was he did in those days with his friends.
Getting back to the story, as I said it's late and I'm watching TV. I had finished a cigarette about 15 minutes before this happened (take it as you will but I feel it is kind of important to the story). I couldn't tell you what I was watching, but suddenly out the corner of my eye, I catch some movement directly below the light fixture in the living room. I turn my head to look and there, plain as day, was a smoky figure floating under the light, which is about seven and a half - eight feet off the floor. It appeared humanish. The head, torso, and arms being the most distinguishable features and it did have legs but it lacked hands, feet or any real facial features.
I have no idea how long I stared at it as it floated there, kind of waving its arms up and down out at its sides. I don't remember feeling scared or anything like that, more just freaked out that I was seeing what I was seeing as this was my first up close apparition.
I looked away for a second or two, then looked back and it was still there. I stared (I'm sure completely unblinking) for at least two full minutes. Then I blinked, shook my head, and rubbed my eyes but when I looked back it was gone.
I know some of you will say, "Well, you did just finish a cigarette" but cigarette smoke doesn't last for 15 minutes or get localized like that forming into a humanoid figure. And I do remember I was nowhere near tired.
I knew my house was haunted before that, as I stated earlier in my story. It was built in the late 1800's and was originally my great-grandparents' house.
Other things that I have noticed in that house were footsteps in the attic. Our attic was only used for storage and was totally cluttered with things which would prevent the rapid back and forth that I had heard.
Another time, I was in my room watching TV around 9 or 10 pm with my cat sleeping on my chest. My room back then was tiny, only seven foot by seven foot square. It contained my twin size bed, a dresser and my TV.
So I'm watching a Cubs game (I think) that night when Beavis (it was a vote with my brother's and my friends don't ask - Beavis won), my cat, wakes from a dead sleep and begins staring intently at my door. Then he slowly tracked his head from the door to the window never leaving my chest. When whatever he was staring at got to the window (jumped out? Disappeared? I couldn't see it, whatever it was), he shook his head, yawned and went back to sleep.
Another thing that happened was we had one of those 35 gallon Rubbermaid trashcans with the locking lid for our kitchen garbage. One day while heading from my room (which was just inside the dining room right off the living room) to the bathroom that was in the kitchen by the back porch door, the garbage can lid popped its lock, did a rather graceful two and a half flips, and landed on its top in the middle of the kitchen. I really had to use the bathroom at that point so I didn't care what it did. I just did my business then on the way back, I picked up the lid and put it back on the garbage can securely locking it back down.
The last of the oddities that I noticed about that house was about a year before I moved out. I was standing at the front gate talking to a friend. I kept glancing at the attic windows when a female figure with green eyes, red hair and a long white gown (the type that women used back in the late 1800's early 1900's as a dressing or sleep gown) slowly materialize then fade away. My friend didn't see her.
I was told that my great-grandmother used the attic as a bedroom when she and her husband - my great-grandfather - had arguments or something of that nature. I was also told that she died up there and, if I remember correctly from the family stories, she had green eyes and red hair. Of course her spending a lot of time in the attic could account for the footsteps that I had heard up there but they always sounded heavier than a woman's footsteps.
Well that's the story of the house I grew up in. I never felt scared while living there, maybe it was because the spirits were family. Believe my story if you want or don't, it won't bother me if you don't believe.