I'll start :)
When I was at school I had a Saturday job at an old stately home which did weddings, one Saturday we were putting the crockery away into the storage cupboard which was in a little room off a long corridor, as I stepped out of the room I stopped as I felt someone was about to walk into my path on the corridor, I looked and saw all this white blurry mist, I looked across to the colleague I was with who said can you see that too, I screamed and ran the hell out of there! I later found out the colleague I was working with was a psychic/clarevoyant and she said the mist I saw was a young maid and she was just as scared of me as I was of her!
Never went down there again..scarred me for life, can't drive past the place without feeling funny!