The P's and Q's

Don't forget your P's and Q's. Mind your manners include please and thank you. I think that the amount of pleases and thank you's is quite important to not sound too abnormal, too weird. So it'd probably be can I have and then A and then the drink like a pint of a pint of lager or a pint of ale. And you say it quite casually, of course, can I have a pint oflager, please?