I stumbled upon this while listening to some performances of 'Holy Night'. I think the singer was getting his wisdom teeth extracted while he sang this. Although it's difficult, try to make it pass the 2 min mark. He really belts it out of the park around that point.
I completely agree that you should NOT be forced to tip. But the details of having to refill their own drinks and waiting for chicken wings comes across as a little funny. It's not like they got sick or found fingers in their food.