(Thread prompted by the one about seeing someone with lizard eyes, who is possessed by a demon)
I have once. Waken from a dead cold sleep, my girlfriend and future wife said to me "we're not alone". I looked at the foot of the bed and their was a very angry young boy. I was shocked and became afraid myself as I sensed a power there, and then, like a balloon popping, he vanished.
She asked me what I saw, I said a very angry young boy, who looked to be age 9-10. She confirmed that was what she saw too.
I suppose it could have been an angry guardian angel, or even a passing demon, but let's go with ghost.
I have never doubted things spiritual since that day. I was about age 19.
I was young- maybe 5 or 6 years old. Visiting my great-great uncle (he was pushing 100 at the time) in his retirement community. Parents were checking our family in at the front desk, and I see an old lady in a blue track suit sprint across the lobby and vanish. Being so young, I was confused about what I saw and didn’t mention it to anyone.
After checking in, we go up to my GG uncle’s apartment, and he tells us that one of his friends in the community had passed just the day prior. She was a lady who used to be an avid runner, but would still power walk the halls on a regular basis wearing a blue track suit.
Little me got crazy goosebumps in that moment. Still didn’t tell anyone what I’d seen— somehow knowing it wouldn’t have been well received.