It's stolen from Viz. Except for the bit about drinking responsibly, that replaces a fake link to a 'www.getyourselfonthesauce.gov.uk' public service website.
It's available as a T-shirt, and I've got one. Others in the range are 'A Pint and a fight- a Great British night', and 'Don't be soft- Have a Fight!'
Although they tickle me, I wouldn't get these, as after being lamped it'd be very hard to argue that you weren't asking for it.
Not a sign as such, more a sign of the times? I've spotted these in a couple of North London pubs: https://www.pinterest.co.uk/meikevan...athroom-mania/
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On toilet door of Greedy Pig micropub, near Bradford
'I only drink on two occasions, when I'm thirsty and when I'm not'
Brendan Behan
On toilet door of Fez micropub in Margate.
Come On You Hatters!