Ok, mine is fairly tame, but I can't pass up a triple-dog dare. I think I've shared this before, so if I bore you, excuuuuuuuuuuuuuuuuuuussse me!!
I was a kid, maybe 7-8 years old. We were visiting my granddad's place in the Middle-of-Nowhere, Idaho. The house was the old family place, had been there forever. Old-timey place with a wood cookstove in the main living/kitchen area. One bedroom was built off the main room and the rest of the bedrooms were upstairs. Outhouse for that sort of thing. Everywhere inside and out of that creaky old house was COLD, except for the main living/kitchen room, so everyone congregated there.
All my young life, I'd heard about Oscar. He was my granddad's uncle. Oscar was what was termed a ********* in those days, and he lived in the rooms upstairs. He would lay his head against the screen to the window outside to watch the world go by, and the indentation left behind was still there to see, plain as day. Granddad always said Oscar still lived upstairs, even though he'd been dead for decades. Anytime something went missing around the place, Oscar took the blame. I always assumed it was just kidding around and ghost stories.
One night, we were all hanging around in the living/kitchen area, talking and laughing. I remember my granddad was playing his guitar. He stopped for a moment, and when he did, I heard someone walking around upstairs. The sound of footsteps on a wooden floor, a sound completely ordinary. Except... we were ALL hanging around in the living/kitchen area. It took me a moment to work that out. I looked at my granddad, he grinned at me and said, "Oscar."
<insert spooky music here!>