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Originally Posted by david.ewles
In English pubs, ale is ordered by pints and quarts. So in old England, when customers got unruly, the bartender would yell at them mind their own pints and quarts and settle down. Itâ₠¬ÃƒÂ¢Ã¢â‚¬Å¾Ã‚¢s where we get the phrase †œmind your Pâ₠™s and Qâ₠™s.à¢ÃƒÂ¢Ã¢â‚¬Å¡Ã‚¬Ã‚à Â
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A more likely explanation is that it comes from printing since p and q are very easy to mix up when the letters are reversed, so compositors were warned to "mind their p's and q's".