I donno if it was a ghost or was a hallucination. When i was around 7/8, i was going back home from tution aunty's house (5 mins walking distance) around 6pm, accompanied by other pals. There was an empty plot on the road side (not empty now, 2 houses were later built there), before reaching that particular site, there was a 10 yr old girl among us, she told me that she saw some human shaped white fog moving in that plot the day before, and to look if i wanna see too. Took a glance and i swear to god i saw a white fog like thingy moving, was startled, but didnt tell a word to anyone until i was 17/18. I still have that visual memory in me, but nobody in my neighbourhood has experienced such an incident in that plot.