Yes, parts of that other thread are coming back to me, there was the one about the women (yes, women) waiting in a long queue who chat all the way up to their turn to be served and only then start rummaging for purses, credit cards, etc, and keep on chatting even though the bank teller/checkout operator is gritting their teeth.
Or people at the head of a queue who are just about to give their order or make their request as their mobile phone rings. They then treat the person on the other end of the mobile phone as their priority.
Or people who remain at the bar counter after they've been served, forcing others to shout their orders over the top of them.
The British Legion in Reddish, Manchester, has an ordering system where you walk down an aisle marked by a tubular steel balustrade, and only when you get to the end are you served. Once you're served, you have to clear the area.
That's how you run a bar.