I was at a concert at the Ambassador in Dublin recently and got a pint at the upstairs bar, and walked a over the other side of the balcony and after a few minutes the barman tapped me on the shoulder and handed me €15. It appears that due to the dim light (and possibly my previous libations) I'd confused a 20 for a fiver. Fair play to the fella, I think such honesty is increasingly rare in our lovely city!