What is the scariest thing u have seen or experienced?

I had a friend who used to talk to the empty space in front of him. When asked, he said that he was talking about his day with his brother.

His brother had passed a few years ago.

I did go near him a few times when this used to happen , and didn't feel anything strange ever. Except that one time I suddenly felt the air around me freeze, like I had stepped into a freezer. It was so weird.

The other time I saw a lady sitting on a tree while I was returning from a night show and ran like crazy.

None of these incidents are direct proof of something paranormal, but I was scared shitless.

I still don't believe in ghosts though.