For the longest time I had a fear of unfamiliar shower heads well into adulthood. http://i.imgur.com/qcVVJwCl.jpg
Like if I'm in a hotel room and need to take shower, I have to take a deep breath and stare at it, telling myself "it can't hurt me" over and over again. The same kind of nervous I get in a plane that's about to take off. I still get a bit nervous to this day at 38 years of age. I suspect something happened to me at a young age but nobody seems to know what it could be. I've noticed that my 5yr old daughter is also scared of them when they make those whoosh-sounds just before water comes out. Maybe I was traumatized from that too.... I dunno...