&gt; Forgot to put in your order, brought the wrong food, was mean to you<p>These are all descriptions of under adequate service and this server should be reprimanded, potentially fired if this keeps up.<p>Examples of under adequacy removed; You and the parent seem to have similar outlooks. As soon as a server meets the bar for adequate service, the customer is obliged to tip 10-20% based entirely on what they can sustainibly afford.<p>Rarely does one go higher than 20%, for the truly grand experience.