So this is a r/thathappened worthy story, but bear with me.

This happened 7 years ago. There was an old childrens hospital building in my city built by the soviets after WWI and abandoned after 1995. Now it was a haunting place, especially in the night, plus some stories about experiments on children surfaced over the years, so the building became a popular place with paranormal activity researchers or teenage madlads.

So for the better or the worse one night me and my friend decided to go check it out. Now we took a camcorder and a camera ( also we were a little bit drunk). We went into the main building and decided to split up. I took the camcorder, he took the camera.

Some time later I was walking alone and filming the operating rooms, when suddenly heard somebody walking not far behind me. Turns out it was my friend. But as I went further he started acting very strange - he was very silent, kept distance and only started laughing when I filmed him. After some time he dissapeared and I thought that he was trying to scare me, but continued on.

So, after about a hour, I walked outside of the building and there was him, standing and complaining where the hell was me. I said " But dude you were with me for some time when we were in the operating rooms. " What operating rooms" - he says, " I was in the wards all the time. I then asked him to cut the bullshit, because I had filmed him walking beside me. So we turned the camcorder on and after couple of minutes I was shaken, because it appeared that for about 20 minutes, when I was in the operating rooms, I was talking to myself and filming thin air.

So that's my story, believe it or not, but to this day I still wonder was this caused by 2 bottles of beer or I have seen a ghost.