When I went on one of those "Broadway Open House" tours, one story the tour guide said was that once a robber got into a theatre, tried to steal something, and then fell into the orchestra pit because there were no lights on. The robber sued the people who owned the theatre, so the owners installed a ghost light.
I don't know how true that story is, but I thought I'd just throw it out there.
"Chicago is it's own incredible theater town right there smack down in the middle of the heartland. What a great city! I can see why Oprah likes to live there!" - Dee Hoty :-D