Used to use it throughout the 90s - usually upstairs 'lounge' for us.
There always used to be one group of guys who ordered 7 pints of Guinness for each round and took the pints off the bar as they were being poured, slowly.
The staff always used to lose count so they inevitably ended up with 2 or 3 free pints per round

It finally became so much of a tip that we stopped drinking in there.