I've got a decent one. My brother and I were staying at my grandmother's victorian home in St. Paul, MN back in the eighties. We curious about the attic, so we borrowed the attic door key and spent an afternoon digging through old trunks and boxes. My grandmother thought we were nuts- she couldn't walk up the tight staircase any more, and warned us it was full of "junk." We found items from a trooper's WWII trunk (he rented a room in the late '40s), 1920s era dresses and hats, old newspapers, and a finished bedroom with a small closet. The bedroom had a dresser, a bed with no mattress, and a few old toys and boxes in it. The rest of the attic was unfinished. When we were finished we locked the attic door (old skeleton key) and put the key in the dresser in the bedroom that I was using.
That night my brother and I stayed up late downstairs in the living room. We finally migrated back upstairs and he went to his room and I to mine (I had my mom's old bedroom). Our rooms were adjacent to one-another, at the front of the house.
At around 1 or 2 am I awoke to weird noises. Something was moving around up in the attic. I immediately opened the drawer to see if my brother grabbed the attic door key and was exploring- the key was in the drawer! A few moments later my brother came running into my bedroom. He was freaked! The noises in the attic woke him too. We walked together past the attic door and peeked in my grandmother's room- she was sound asleep. We tiptoed back to my room and listened to the noises- it sounded like furniture moving. We wondered if we'd opened a window and let a raccoon in. After an hour or so the noises stopped, but we slept together that night as we were so freaked.
In the morning we decided to find out what had happened. We took the key, unlocked the door, and cautiously walked back up into the attic. Everything looked the same. All the windows were closed. We walked across the attic to the bedroom and opened the door...
All the furniture had moved! Plus all the dresser drawers were fully opened. I still feel a chill when I think about it. It was a small room, so moving the furniture was no small feat. We ran back down the stairs and told my grandmother everything. She smiled and laughed, and told us it was all a bad dream. When my parents returned later that night we told my mom about the noises and the furniture. She turned pale, and then told us how weird it was sleeping in her room when she was a kid. Every now and then she'd be awakened by weird noises in the attic. She was never allowed to go up there as her mom said it was dangerous and full of junk. She told us of how it sounded like furniture moving... details we experienced, as well.
It is all true. It is so funny to ask my brother about that night. His eyes open wide and he shakes his head, and admits he's still freaked by it all.