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Google-owned YouTube flips their videos upside down today part of a “New Viewing Experience”. YouTube suggests you turn “your monitor upside-down” as their internal tests have shown “that modern computer monitors give a higher quality picture” this way. Just append a “&flip=1” parameter to a YouTube video page URL, and the video and other parts of the page will be flipped. (Videos linked from the YouTube homepage also use the flip-parameter today.) The flipping parameter does not work with all videos, but it works with most of the videos :).
