Upside down Internet Screen?

I was watching an episode of South Park at SouthParkStudios, and that was the only window open. The background that normally displays other videos and such turned upside down, but the video continued playing correctly so I just ignored it. When I was done, I went back on to the Internet (I use Google Chrome) And /everything/ was upside down. The exit on and url bar are the same, though. What happened? (By the way, pardon any typos. It's hard to type while upside down -_-)