Wasn't this from an Alfred Hitchcock movie?
Or maybe Mel Brooks ...
An excerpt, from CNN:
Pooping pigeons forced the Kings of Leon to abandon their St. Louis, Missouri, concert after just three songs Friday night, the rock band's management said Saturday ... an infestation of the birds in the rafters of the Verizon Amphitheatre bombarded the musicians as soon as they took the stage, according to Andy Mendelsohn of Vector Management ... "Jared (Followill) was hit several times during the first two songs," Mendelsohn said of the band's bassist. "On the third song, when he was hit in the cheek and some of it landed near his mouth, they couldn't deal any longer. It's not only disgusting -- it's a toxic health hazard. They really tried to hang in there."