Mind your P's and Q's
Mind your Ps and Qs - Wikipedia
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Mind your Ps and Qs is an English language expression meaning "mind your manners", "mind your language", "be on your best behaviour" or similar. Attempts at explaining the origin of the phrase go back to the mid-19th century.
It should be, "p's and q's" in lower case. Children learning the alphabet confuse those (and b's and d's as well). Upper case P & Q are not problematic. At least that was what Miss Spencer taught us in 2nd grade. I was in love with Miss Spencer...