Tell me ur scariest irl horror experience

I'll go first. Now this is something that geniunely happened and kept me awake at night for a while. It was around 8? pm that we (my sister, her friends and I) decided to leave the park that we were in. Its a closed garden/abandoned type but its in the neighbourhood and not really closed off so people can go in. I never really went there because there was always just something off about that place.

We left the swinging chair?(idk how to describe it)and started walking off , idk what we were talking abt but i distinctly remember one of my sister's friend looking back and just growing pale and then just run screaming. I rem looking back and seeing something, idk what it was but it looked human and there was no way some guy just walked up cuz the its walled off and the only entry/exit was the way we were going. I dont know what he even looked like because as soon as i caught that glimps i just ran. It just screamed danger and even now writing this I'm literally getting chills