[ NOTE FROM MODERATORS: This thread was split from the following thread on the Ontario board: http://chowhound.chow.com/topics/738869 ].
Was it on the bill or the debit/credit machine?
I know some of the new wireless debit / credit machines that restaurants are using now come with a feature to make things "easier" for the customer. They give you a choice between: 0 tip, $ tip, % tip, 15% tip or 20% tip... if you choose the second or third you can type in your own number all others calculate for you (on the after tax amount).
BTW I just read that at Batalis new restaurant in NYC there is an automatic 23% gratuity which the staff is sueing over as they are not receiving their fair share...