I had a weird incident when I was a kid, only one real notable thing in my life (apart from a vivid dream I had when my sister died, but that is too long and deep to even bother with at 1 am) but it holds me to this very day.
The time if I remember, it seems around about late primary school, so that puts it at me being in year 4-6 at school, which basically means somewhere in between 1997 - 2000.
Ok:
When I was a kid, me and my twin brother (he's aspergers/autistic btw) shared a bedroom. Ended up becoming just my room years and years later but nonetheless.
Anyway, the room got shuffled around alot, different bed positioning over the years, bunks entered as a phase for a while.
But once, our beds got moved in such a way that my bed was sat against the farthest wall, with me basically looking from where my head rested, right outside the window opposite the room, which, at the time would have it's blinds drawn pretty much all the time. At that window is an old tree that is basically dead and taken over by a strangler vine.
Directly outside the window with that tree is a clusterfuck of leaves and shrubs, it is literally a small little jungle just outside that window. I'd always hear noises in it as a kid. I never slept much and I remember I used to sneak out into the back room and watch rage late at night (Australia btw).
Anyway, here's where it happens. One night, I woke up, from deep sleep, it felt like it would've been smack bang middle of the night, like 2 or 3, a pretty late hour for like an 8 - 10 year old boy to wake up.
Anyway, the first thing I see when I open my eyes, is the stark blackness, and the moon hitting all the leaves and what not on the tree outside. Very stark shapes of jagged limbs and what not. Really contrasted full moon type night lighting.
Anyway, suddenly realize there's a large silvery balloon looking thing at the window. It looked just like one of those big white owls with the dark eyes. Thing is, the "eyes" appeared to move, until it looked as though there was just a big hole in the middle of this thing, that kept yawning open and shut.
I felt the most immense terror I've ever felt in my life, and this thing, was a real object, a real tangible object, being lit well by the moon, at a window I was VERY used to looking out of, every night.
I really could've sworn this thing was an owl, but I always associated Owl's as big brown hairy things with yellow headlight eyes. It wasn't until years later I saw one of those white creepy looking owls on tv or something and IMMEDIATELY went "THAT'S WHAT IT LOOKED LIKE" but yet, it didn't. It was....similar, but it just seemed a hell of a lot bigger, and the way the "eyes" moved and repositioned themselves around the "head" was just weird.
Heres a gif I scratched up in photoshop to explain what I saw, roughly. Trust me when I say this was a real object, a real thing that I have never seen since. It was living, it was moving, and it was incredibly big and round and silvery.
More important to note, that what it did in that gif, but much more violently, and it appeared to move up and down the front of the object.
The weird part is though, thinking back to it, I don't think I could move. I figure this was just terror or something, but I remember literally not blinking, not even moving my gaze from this thing one twitch. Just staring into the deep swelling black shape on the front of it. I almost seemed paralyzed by fear.