Fear of plummeting bird droppings.
Who HASN'T been crapped on by a junk eagle (aka: seagull), pigeon, or anything else with wings and a sniperous aim? It's enough to induce spontaneous vomiting! Seagulls eat fast food tossaways. Or anything . It's not just the gross green or yellow tinge as the bird-bomb slimes its way down your shoulder or side of the face - which triggers the big puke, it's also the stench.
The intensity of my Aero-Excretory Phobia is directly relative to the number of birds flying above my head.