Yes ring sting is not a myth. My brother was spending a week with me when I was living in Durban and here was a burger joint called Gobble And Go. They were an Indian fast food outlet that was quite popular back then and their sauce was so good, but had a rather harsh burn. I only remembered about this when I was in the UK recently and my brother mentioned this story when we visited a curry house. It did make me chuckle as he had no clue what was coming.
I always pay for birthdays lol and I also thought the bill was very reasonable with drinks.