Haven't read whole thread, sorry if others have said something similar:
I was in a restaurant in the US this summer, and gratuity was already included on the cheque. There was also a space for 'additional gratuity', which seemed ridiculous, but I went along with it. The waiter then argued with me that the % of this added tip was not enough. I was being asked for extra, extra gratuity.
Odd that it's a percentage system. I'd imagine serving a cheesebuger is as taxing as serving caviar, but clearly not. If your meal cost $200, then the waiter gets a bigger tip than someone who does the same work at a cheaper place. It doesn't add up.
Now in Iceland it's rude to tip, because that implies that the waiters are not being paid enough. That must be the case in the US, which is sad.
On the additional tip thing, just two weeks ago I went to a place in Atlanta. All of us were 21+ except for one guy and then waiter carded us as soon as we sat down. This was a normal restaurant and no requirement to be 21. When he saw the under 21 card the guy tried to send our friend to the cops.
Needless to say my surprise when I had a mandatory 20% tip on my bill and not only that, but a blank asking for an additional tip.
When I signed it and handed it back it looked like this:
Amount: 18.00
+ Included Gratuity: 3.60
+ Additional Tip: -1.80
= Total: 19.80
Thank goodness the courts have already noted that gratuities are never mandatory. But, I still got billed 21.60. So I just called up the credit card company (copy of receipt in hand just in case) and got it changed back to the 19.80 it should be. The nerve of some waiters. I only gave the 10% because I knew the busboys would get some of it.