The only ghosts I have ever seen are when I've been sleep deprived for more than 48 hours, or had a fever over 103. I've never seen any real ghosts at the Haunted Mansion, either in
Disneyland or Walt Disney World.
Except me.
I am in a wheelchair, and one year, Disney ran out of the yellow mouse ponchos, and had clear ponchos which look white in the light of the hallway. I was rolling back towards the elevator, poncho billowing around me. I was just about to reach the elevator when somebody stepped off, saw me, and SCREAMED!!!!!!
I let out a short scream of surprise, my husband looked at her, looked at me, and then started laughing hysterically. When I realized what had happened, I did too. He joked that he took home his personal happy haunt.