From the Huffington Post:

In answer to that age-old question of "who watches the watchers?" the answer would appear to be "The Internet," as The Observer reports that one professor in the Netherlands was seen streaming porn online at the conclusion of a lecture that had been streamed online.

A professor visiting Wageningen University in the Netherlands had concluded his lecture and was browsing the site -- with his laptop still plugged into the room's overhead projector, according to The Observer. There, beamed onto the wall of the empty classroom behind him, was an X-rated video that was not on the syllabus.

And what the Internet giveth, the Internet taketh away, as the lecture was being streamed online and the feed had not yet been disconnected, according to CNET. The fallout from the incident then began to spread over social networks when a Redditor posted a shot of the professor watching the video to a thread reserved for "WTF"-type content.