Hypersensitivity Pneumonitis

Watch Hitchcock's "The Birds"! Or North by Northwest. 

When I hear hypersensitivity pneumonitis, I think of bird fancier's disease. I also think of the time back in middle school when my school had a really bad seagull problem and I got bird poo splat all over me a frequent basis. They finally put wires across the buildings to keep the birds out, but not before putting fake owls on top of classrooms to "scare" off the gulls.