I have heard rumors from senior employees of a patron named Dr. Edmund Musk back in the early 1920's who was accidentily locked in the then called Rush Medical College library. He apparently suffered a stroke and was found dead by security that following morning. Employees state that during closing time they could still hear the late Dr. Musk moaning for his release.

P.S BOO! This story is a complete fabrication, but I must say that it doesn't lack imagination.