Originally Posted by jsm
If the tip is included I do not add an additional tip. It is annoying that you can not reduce the tip for bad service. It also give the server no incentive to provide great service, since they are already getting 18% no matter what.
If the service is really bad, and since the tip is voluntary, you could always cross off the 18% and add whatever you want - or nothing. In New York it's against the law to include a service charge or tip, unless it's for a group of 6 or more.