Went to Da Nico restaurant in NYC's Little Italy today. The food was very salty and was bothered by fruit flies throughout our meal and we had to wait forever for the check. When the waiter finally brought the check, i noticed that they added a 20% tip onto the check. Now I know that they sometimes add an automatic 18% - 20% tip for a large party but it was only the 3 of us. The busboy took the creditcard before we got a chance to ask the waiter what was up. When the credit card holder was returned, the waiter had put a dash in the tip area and took it upon himself to write in the total area with the 20% tip already added just as it was in the computer generated bill. As we were entertaining a guest, we didn't want to alarm or create an uncomfortable situation for our third party so we just left. We are pretty decent tippers, usually leaving 15%-18% and 20% for exceptional service (this by no means was exceptional.) I feel so angry about this. How arrogant of them! Can this be considered illegal?