Heres the quick version before i pass out.. Last year my family bought a foreclosed house.... had an interesting bunch of people that lived there before we bought it. 7 strippers lived there, a random black family owned the house for like less than 6 months and then a black hardcore like grange, screamo, hardcore ish band owned it right before us.
Apparently the hardcore band members also were slangin crack rocks out of the house also... so one day they got in a fight about whose stash was whose, and a physical fight broke out (public records from the investigation told us so) They fight moves up into the storage room upstairs. (eventually my room) When one of the band members stabs his friend through the neck with a screw driver. The guy who got stabbed bled out, exactly where i later kept my bed.
To get to the trippy stuff, I had MULTIPLE experiences with seeing this guy, or things randomly going missing, or doors swinging wide open out of nowhere. But the most defined experience was when my girlfriend was spending the night. I had to wake up early for Baseball practice at 5:30 left quietly like always and pulled my sheets up to make my side of the bed. (kinda a neat freak)
After a normal fairly easy practice i get home around 8. I head upstair to wake my girl up for work and the door is partially open, strange... but whatever. I open the door the rest of the way and with just a little bit of light coming through the window, i see my bed sheets on my side of the bed pull back and I literally see this figure float into the wall next to my bed.
At this point i am completely shitting bricks but trying to remain calm so i don't freak her out. I take off my baseball stuff and crawl into bed... "My girl goes what on earth are you doing?" I say i just got home from practice... and she says "oh, i thought you got home about an hour ago... i must have just been dreaming."
So not only did i see a ghost but it was sleeping in my bed next too my girlfriend.... Gnarly ass stuff and i still get crazy goose bumps and chills every time i think about this.
I have tons of ghost stories, i must just be ummm "lucky" Pretty regularly I have random strange experiences.
I have found gave stones in a field by our house similar to OP's.. Ghosts turning on showers and walking down hall ways. Lights randomly turning on... all kinds of strange things!