Hello, I'm 22 and I live in Seattle, WA. This isn't as exciting as a lot of the stories I've read here, but it's interesting, nonetheless.
During my adolescent years, my father and I lived in my great-grandmother's old house. (He took ownership of it after she died.) This house was very special to us, as it had been in the family since my young great-grandparents came from Italy, and my grandfather had been born in this house. Not too much happened when I was living upstairs, except I remember one particular night when I woke up to the sound of someone repeatedly banging on my closet door from the inside. I'm not sure if I was dreaming or not, but I remember I said something that made no sense, and the banging stopped. The next morning I had the feeling that I had been talking to someone in my sleep or in my dream, and whoever it was had been waiting for me to answer a question and grew impatient, hence the banging.
Another night I felt someone kissing me, and I woke up and there was a man, probably in his 50's, I'm not sure, but he looked shocked and embarrassed that I had caught him, and he lay down on to the bed and disappeared. I was too tired to even worry about being scared. My aunt remembers when she was much younger, walking into the livingroom and seeing her uncle, who had recently died, sitting in the recliner, large as life. I think it may have been him kissing me.
When I was 18, my friend and I moved down to the basement. My great-grandparents had a wine cellar down there, which is now gone. Once, I was alone reading or something, and I could hear the distinct clinking of wine bottles, as if someone was reorganizing the wine collection. It was pretty spooky, even though I had nothing to worry about, so I went into my roommates bedroom, just so I wouldn't be alone. My roommate had an experience once. She was in her room and had lit candles and was playing her stereo. She was dancing around, and out of the corner of her eye, she noticed the profile of an old woman on the door. At first she found it eerie, but then she felt a sense of warmth and protection. When she told me this, tears came to my eyes, as I knew it was my great-grandmother. I told my grandfather, of course, and I think it made him very happy to know that someone was watching over the house.
The house has since been sold to a development company, torn down, and replaced by condos. I drove by once, to see what everything looked like, and it was just too hard not to see the house there, so I sped away. But we can all just imagine my great-grandma standing in her doorway, shaking her head, and saying her usual saying (in VERY broken English), "Oh mine, everything's changed, everything's changed."