It's the apostrophe!
It's Friday, so maybe there's time for a little humor. Courtesy of Stewart on the ID-Cafe mailing list, here's a cartoon for the writers out there: it's Bob [the Angry Flower]'s Quick Guide to the Apostrophe, You Idiots. I don't know how Bob managed to avoid the apostrophe in its/it's, as its use is the one that it's abused the most, or so it seems to me :).
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![Bob [the Angry Flower]'s Quick Guide to the Apostrophe, You Idiots](http://angryflower.com/bobsqu.gif){kind=link}