I guess it's true that, had I tipped at all in that instance, I would have tipped based on what I paid on the night. Bearing in mind the Groupon was already pai

I guess it's true that, had I tipped at all in that instance, I would have tipped based on what I paid on the night. Bearing in mind the Groupon was already paid for, that wouldn't have been a lot. Having said that, I also went for a great Groupon meal somewhere else, which included a cocktail that was so good I had another 2, bought more food on top and ended up paying as much as a 'regular' meal would have been elsewhere (and tipped accordingly for the good service). That was the exception to the rule, though, even based on a very small sample size.