There must be some really obscure ones out there with the amount of MNs out there.
Mine is the fear and dislike of really old films and old pictures, pre 1960's.
Had it since I was a child, mainly black and white but will freak out to the Wizard of Oz!
Sat with my back to the projector throughout our History of Fashion classes in College till we got to the 60's. I hate Laurel and Hardy e.t.c. any silent movies, any really old ones makes me really freak out. Old pictures are bad too, dp's family have l;oads and I hate sitting in the room where they all are.
I actually threw up a few times because I was eating my dinner and my brother used to tease me by turning the tv to Harold Lloyd or Charlie Chaplin and then would stop me from turning it over until I would scream for my mum. I just find that people back then were really quite disturbing to look at and I think it is also the way they move in the old footage clips, really not sure.
Its not as bad now as I don't want it to rub off on my boys but I will leave the room if they happen to watch something old with dp and do the washing up or ironing in another room.
Don't know why, not sure how it began, but there must be others that are worse and weirder than mine.