In central Scotland around Glasgow where I was born, it used to be common to ask for "a hauf and a hauf pint" a hauf being a half, what you got was a half pint of beer, usually "heavy"[strong beer], and 1/5th of a gill of whisky. This I believe is known in some parts of the USA as a boilermaker. I don't know if it would go down well in Ireland but a friend of mine [Irish] used to call Guinness "lunatic soup" The other lovely habit in Ireland is to serve hot whiskey in the cold weather, this is really a hot toddy.

I just remembered about the weird rule in Scotland years ago that you had to be a "bona fide traveller" i.e. more than a given distance from your home address in order to get a drink in an hotel on Sundays.