I was told by my co-workers, that just before I came to the reference desk, a patron had punched another patron in the face. He was punched in the face because he refused to let the other man use his cell phone. The man decided that he wanted it anyway, grabbed the other man, reached for the phone and punched him in the face.
The victim chose not to report the incident to security, or file a police report. He felt that his attacker had mental issues.