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My old college (16-18) had a house like pic related that was used as an off-campus building for occasional classes during maintenance of the main classrooms
We had a class at 1pm so we used to spend lunch there because it was always empty and we could fuck around.
One day, there was 3 of us fucking around in a classroom. One of the lads went to the toilet and came back and said "Come see this, it is creep as fuck"
We went to the toilet and there was a silhouette just stained onto the wall. I have no idea to this day what it was, but we were all slightly creeped out by it for some reason. As we were inspecting it, we chipped a little paint and saw that the silhouette was deeper than the top layer of paint. It was like a human-shaped damp patch on the wall
As we chipped away we heard and felt two distinct bangs on the wall. One of my friends said "Hey, maybe its a ghost... knock if you are a ghost"
*bang bang*
We kept doing this, saying "knock if you are a ghost" and we kept getting a really loud reply. It sounded like it was on the other side of wall so we realised we were probably being sp00ped by someone who happened to also be in the building.
We went into the adjacent room and no one was there. We started to scope out the rest of the building and literally no one was there. We went back to the toilet
"Knock if you are ghost"
*bang bang*
At this point we were so creeped out we just left the building until it was time for class. We told our teacher and he said "Yeah... you're no the only ones who've said that"
The silhouette was painted over a week or so later. By the end of term it returned. I don't believe in ghosts but it is without a doubt the closest I've come in my life. I still don't have an explanation and neither do my friends