"All your base are belong to us" is an internet meme that comes from the opening cutscene of the 1991 European Sega Mega Drive version of the video game "Zero Wing"
The meme developed as the result of poorly transalated Japanese in the opening text. Many photos subsequently appeared on the internet either of genuine hacks, or simply photoshopped to show the phrase. The phrase would often be changed to suit the hack. For example, the Dutch Railways website was altered to display "All your trains are belong to us"
http://en.wikipedia.org/wiki/All_your_base_are_belong_to_us
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