An on-duty firefighter caught a Cambridge, Mass man looking at porn and masturbating in the Waterton Public Library. The firefighter was in the fire station and just happened to look through his window and noticed the man in the library that is adjacent to the library. He called the police and the man was charaged with open and gross lewdness. bostonchannel.com
In Chicago's Northside library, a man was reported with looking at child pornography within the library. Now, mostly he was looking at pornographic video games and cartoons, so maybe the pornography was meant to be for children instead of of children... I dunno and do not want to speculate. chicagotribune.com
So, forward that to your friends that think working at a library would be a cushy job. Welcome to public service.