When we were in school at UW, my buddy Ifish lurker OlyDrifter had a '66 Chevy Suburban/Carryall...we called it a "Crummy". It was in good shape and had just been repainted. OlyDrifter parked it beneath the Alaska Way Viaduct in Seattle one afternoon...and when he came back later he noticed a bunch of pigeons sitting 20' above on the girders...and they had crapped all over his shiny red truck.
There was a piece of 1" pipe 18" long lying nearby so Oly, in a rage, threw the pipe up at the pigeons. He missed...but then the pipe bounced back down and smashed his windshield really good.
Moral: Before you launch projectiles at pigeons, think about what could happen if you miss.