Viral, Good (Bacterial, Still Bad) : Wait Wait ... Don't Tell Me! Videogum's best viral videos of 2009.
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Viral, Good (Bacterial, Still Bad)

I'm putting it after the jump, because there's a touch of NSFW language, but Videogum's roundup of the year's best viral videos is pretty wonderful. I find myself not regretting spending this year watching crap on the internet, but regretting not watching more crap on the internet.