Londonderry was a great place...
...for single lads. Shirt was as often conducted in the Diamond Ballroom which as tad couther than the previusly metioned bar.
The next evolution after "Shirt" was the "grimmy contest". All chip into the pot and the aim was to dance with the most unprepossing young lady in the room, as judged by the "judging panel" at the bar and the winner used the pot to buy the next round of drinks. A certain naval lieutenant from 819 at BKY was waltzing (proper dancing was done in those days) his chosen past the bar area and the beady eyes of the panel.
The Lass says in a loud voice;
"Youse all are havin' a grimmy contest aren't ye?"
"No no not at all I asked you to dance because I I I...." and then realised the perilous path he was going down and stopped.
"Well" she said " if youse aren't , we are, and I've just won. Now **** off!"
The Ancient Mariner