I just read this in Uncle Tom's Unstoppable Bathroom reader (which is a wonderful addition to any bathroom):
The Bluebird is a classic play about two children who go searching for the Bluebird of Happiness. A designer at a midwestern theater thought it would be a great idea to have real bluebirds fly around the theater at the end of the play. So he sprayed pigeons with blue paint and put them in little cages hanging above the audience. Apparently no one ever considered what the paint, combined with the heat from the lights, might do to the birds. On opening night, the cages were opened at the end of the show...showering a horrified audience with hundreds of dead "bluebirds".