Tangential Ramblings

Now I love the apostrophe as much as the next man, assuming of course the next man is an apostrophe-crazed fool. But there is one use in particular that aggravates the shit out of me: when people head documents Do's and Don'ts. Or Do's and Don't's. The latter may be worse, with two faux pas, or better as at least it's consistent. If you have to use the phrase, Dos and Don'ts, please. Thank you.