Posted by Sathyaish on March 20, 2004
In Reply to: Re: Ps and Qs posted by ESC on March 20, 2004
: : Watch your Ps and Qs isn't listed on here, but I have been told that it means a long time ago bartenders made marks on the wall of how many pints and quarts were sold to keep track of them.
: That's one theory. Several have been proposed here on Phrase Finder. If you'll click on the link below, it will take you to one discussion that lists several theories.