Conversation so far:
what does mind your p’s and q’s mean
Mind your Ps and Qs is an English language expression meaning mind your manners, mind your language, be on your best behaviour, watch what you're doing.
when did the phrase mind your ps and qss originate
Attempts at explaining the origin of the phrase go back to the mid-19th century.
is the original author of mind your ps and qs known
The origin of the expression is unknown, but there are several possible theories.
can I have one origin theory of mind your ps and qs
One explanation dated 1851 is a literal interpretation, regarding the lowercase letters p and q in the context of the school-room or typesetting in the printing-office.

Question: was there a theory involving alcohol
Self-contained rewrite: was there a theory about the origin of mind your ps and qs involving alcohol