My family and I used to go “camping” a lot when I was younger. Camping consisted of renting a cabin in the woods and spending a little time in the wilderness. So we consistently rented this cabin in Pennsylvania where we would spend long weekends, when everyone in the family had some time off.
My two brothers and I, each being in the 9-12 year old range, would always run off into the woods and bullshit about while my parents did whatever. The cabin was on a mountain. If you followed a dirt road a ways past the cabin, the forest would open and there was a large field on the top. The field was about the size of a football field.
Near the edge of the field, on the far side, was a graveyard. The grave yard was pretty small, about 20 graves, surrounded by a wrought iron fence. The fence was about 10-12 feet tall with the gothic-ish spikes on the top. The fence had a gate but it was locked with a thick, rusty chain and padlock. Being kids were able to spread the gates apart enough to squeeze through.
The small grave stones were very old and worn, I remember seeing one dated 1890 something. On top of one of the graves, just resting on it, was a smooth black stone. It looked like Onyx or something, a little smaller than a golf ball but not perfectly round. My older brother pocketed it, we dicked around a little then left. Back at the cabin, which had one bedroom (where my parents stayed) and large living room/kitchen (where we stayed), we were hanging out while my parents were sleeping in bed. It was probably about 11:30 or so at night when a loud BANG! BANG! BANG! happened at the front door (which is right in the living room.) Me and my brothers were all scared shitless, understandably too afraid to answer the door. BANG! BANG! BANG! again the door shook moments later. It sounded like someone was trying to knock it off the hinges.
My father emerged from the bedroom asking WTF was going on. BANG! the door clashed. He knew by the looks on our faces we had no idea. He grabbed a wood chopping axe we had and walked over to the door. He looked scared shitless himself. He swung the door open and there was nothing but the night. No one in sight. After hounding us for information, and us having no idea, we went back to bed. I think no one slept much, if at all that night. The next day we were back to dicking around in the woods and we again found ourselves in the old graveyard.
The smooth black stone, that my brother took, was on top of the same grave. We ran, we ran fast.