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2010 was a huge year for memes. From Sad Keanu, to endless auto-tune remixes, to people making fun of the real-life events of human beings in peril (or people going insane) or even just harmless image memes that made all of us smile, here are the 25 greatest internet memes of 2010, how they started, what they mean (what does it mean?) and why they're so funny.