Do ghosts exist?

I was at a family wedding in a village when I was 9 or 10. One of our cousins used to tell ghost stories famous in that village to us before we went to sleep. Next day there was some function on the ground floor in the courtyard. I went to the roof of the house which was just a small house of 1 floor. I felt as if I saw two witches in white dresses dancing in front of me. It felt blood was dripping from their lips. I was so scared that I didn't turn back to go downstairs using the stairs. I just jumped from over the building and crashed into the function going below. Didn't injure too seriously because the ground was made of mud. But boy I was scared and everyone was bloody surprised to see a kid land all the way from the top of the building. Just 4 weeks of injury.

Now I believe it must have been my imagination. I was very thin. Almost undernutritioned. My mind was weak and I just imagined things. But it's one of the great memories of my life.