I love XKCD, bumping the thread with some of my favorites.
http://xkcd.com/182/
http://xkcd.com/612/
http://www.xkcd.com/435/
http://xkcd.com/303/
http://http://xkcd.com/522/
http://xkcd.com/456/
http://xkcd.com/323/
and last but probably one of my top favorites (i've got the T-shirt)
http://xkcd.com/55/
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