I have been troubled by a ghost, but not a friendly one. That is, I couldn’t say for certain it was unfriendly, as I didn’t get the impression it had set out on purpose to frighten me - but it did, just by being there!
The strange thing was, that going purely by what I sensed, rather than anything I can pin down, I thought it was scared of me too!
The closest parallel I can think of is when I left the house one day, in broad daylight, and unexpectedly came face-to-face with a fox. I don’t know which of us was more surprised - me or the fox. The fox is obviously sentient, yet not like us, and I had the same feeling about the ghost.
Later (and after considerable research) I learnt there had been a terrible tragedy at that place, about four years previously. Something I could not have known beforehand (it doubtless must have made the news at the time, but if I had made any mental connection, it definitely wasn’t consciously).
I once spoke to a psychologist about it (although I hadn’t gone there for that). I suppose I was always a bit worried it might mean I was mad, so I took the opportunity to mention it.
He said I was much too rational to be insane, and he would lay money on it I never would be. To my surprise, he seemed to have some religious or spiritual belief (though I never found out exactly what it was), and accepted what I’d seen at face value. He said that sometimes, when a person dies a sudden and unexpected death, they don’t understand that they have died. Apparently, instead of screaming: “Who are you? Get out! GET OUT!”, which is what I did, I should have said gently: “It’s OK, you’ve died.”
Too late now, and I don’t suppose I’ll be faced with a similar situation in future, so I won’t have the opportunity to try his advice.
If I had to put a name to what I was feeling from the ghost, I think the single word I’d choose would not be: “malevolent”, but: “uncomprehending”. I felt he/it was uncomprehending of me (as if we were ghosts to each other), but it might have been that my psychologist was right, and he/it was uncomprehending of everything - including that he had died.
If that was indeed the case, I feel sorry that I presumably made matters worse by screaming at it, as it was probably just looking for help, and wouldn’t have understood why I took such fright. It certainly never occurred to me to say: “It’s OK, you’ve died.”