Many years ago I was in a stall at a large (for the time) mall. After a bit I felt uneasy and when I glanced up I saw a young fellow eye-balling me (as it were) from over the top of the stall. As soon as he saw me looking at him he pulled away. I tried to hurry up and finish my business but a minute or so later I looked up and there he was again. I felt really creepy for the rest of the day.