TEN DON'TS FOR DRINKERS

Recommendations for bar etiquette by Black Bo's barstaff:

1 Do say Please and Thank You. Don't say pal, mate etc
2 Do not attract a barman's attention with the word Oi!
3 Order Guinness first
4 Do not drop your payment on the bar to be picked up
5 Do not moan about the head on your pint
6 Do not refer to drinks by ridiculous nicknames
7 Order all drinks at once when possible
8 Do not offer 'the right change'
9 Do not abuse drinking-up time
10 Do use the bribery trick known as 'and one for yourself'

Source: Black Bo's is a fine hostelry in Edinburgh. All this is explained at more length, and in considerably more colourful language here