I believe in ghosts.

I was around 10/11 probably and I went downstairs to get a glass of milk (don't live in this house anymore)
But basically, you could see the TV lounge from the bottom of the stairs (i forgot where the kitchen was not gonna lie)

Anyway I fetched 2 glasses of milk (one for me and one for my brother) and then as I was walking up the stairs I looked to the right, not too sure why tbh and I saw a bald man in a black suit inside my lounge staring outside the window, he was just sorta standing there though, great posture, looked really neat and stuff
Anyway, being the 11 year old I was, I screamed and got tf up the stairs and ran to my parents.
My mom asked like why I was screaming and stuff and I told her exactly what I saw, a few days later she showed me a photograph and asked if that's what the man looked like and it really did look like the guy in the photo. Turns out it was my mom's grandfather and he was a tailor which explains the black suit

but yeah that's my story and it's pretty cool that i got to experience that I guess.
I have experienced other shit like knocking on doors and stuff but it hasn't been that often and I didn't really think anything of it tbh, thought it was just the wind and stuff

I really do have a strong belief in ghosts and stuff though