I had to dig through a week's worth of proxy logs once, when a manager of one of our facilities was accused of watching porn on his desktop. I was told to be thorough. A lot of the URLs were quite obviously porn, some were not, so I was paid for several hours to surf porn sites at work.
The disturbing part, however, was that he also had a habit of printout out screen shots from his favorites - on a black & white laser printer. The bottom drawer of his file cabinet is still, years later, referred to as "the porn drawer."