My single reality shaking experience was 18 years ago, lasted 10 seconds, and happened to my 3 year old.
I’ll be honest, I’m a skeptic but was raised a cafeteria Catholic until 13 so my culture was one where the spiritual world was a thing. I do my little superstitious practices like knock on wood, avoid going under ladders, etc. but really am not a firm believer in ghosts. My backyard literally shares a property line with a cemetery and I have yet to see anything that would make me think ghosts are walking among us. The one and only time that’s shook my skepticism, is when my wife was in the room and experienced it with me. Our 3 year old daughter was screaming and yelling in bed like a night terror but awake if that’s a thing. We went in to calm her down saying “It’s ok Josie(name changed) You’re safe.” At one point she flipped over to face us and in what both of us can only describe as a deep male voice, yelled, “THERE IS NO JOSEPHINE!” She turned back over away from us and then stopped crying. My wife and I turned and looked at each other and both said “What just happened?” We both had heard it. If either of us had been in there alone I’m sure we would have thought we imagined it. But, with another witness, it’s the one time that had both of us wonder what could have been in the room. That was 18 years ago and I’ve never had an experience since then.