Most people have phobias, most of which make sense, i.e. fear of heights or snakes. However some seem to serve no practical use. I remember watching a TV documentary about a man who was terrified of oranges. Are there any really odd phobias out there?
I am petrified of birds. It doesn't bother me to see them flying outside as long as they don't come close to me. In fact, I would never visit someone who had a pet bird even if it was in a cage. I've had this phobia all my life and no one I know seems to know why.
I think this may be due to the fear of having something flying about our faces. The fear of anything which flies, and has the ability to attack from the air I think is quite common. Alfred Hitchcock didn't do much to help with this fear.