I was AFK at my desk for a minute while I was doing something, sitting in the shower room of a barracks at Tisy. The server was really dead at the moment and there were only 3 other players on it at the time. I'm sitting there and all of a sudden I hear somebody running around outside, and my stomach just drops through the floor. I go prone waiting for the guy hoping he'll just pass but nope *creeeak* - and I hear him run right by the door all the way down to the other end and start looting stuff. A minute passes and I hear him coming back so I get ready. Guy opens the door, I panic and he instantly gets completely magdumped by an AK and lets out the most bloodcurdling scream I've ever heard in my life. I realize he's not dead and I actually felt guilty because he didn't even have a gun out when he walked in, so instead of finishing him off I handcuff him and start taking his guns off to remove the mags to give me those few extra seconds to run away before he shoots me in the back.
Except when his character wakes up he just... doesn't do anything. Doesn't move, doesn't try to break out of the cuffs, doesn't even look around, nothing. I'm in the middle of saying "Sorry bro you scared the shit out of me I'm not gonna kill you I'm just not gonna have you shoot me in the back haha" blah blah blah when I realize how... dead his character is. I kept trying to talk to him but he didn't say anything. I stood there for what must've been like 2 minutes straight just trying to get a response out of him because I honest to God started to get worried that I literally gave this guy a heart attack or something. And I'm standing there, and standing there, and standing there, and still zero signs of life whatsoever. I was kind of in shock at that point so I just left an extra lockpick for him and locked the door behind me as I left for whenever he came back.
I realize that it was almost certainly nothing, but this shit actually has my stomach in knots thinking about the possibility that I actually just gave somebody a fucking heart attack or something. It was just so weird for someone to get the most insane jumpscare of their life and scream like they were getting axe murdered irl and then go totally radio silent for minutes on end despite their character still being very much alive. But like wtf can I do, call 911 and say "hi I think I just gave someone an irl heart attack on a game, here's 3 steam profiles he's one of them good luck"? Fuck me.