I have written letters to mgrs or supervisors about employees. Sometimes I tell them, this person deserves a raise. Don't know if it does any good but at least I voiced my opinion. Managers like to hear good things about their employees too. Do you always leave a tip, even if the service is lousy? I don't. A tip is a gratuity for good service and shouldn't be considered part of the bill. I do like it when restaurants put the different amounts at the bottom of the check so you don't have to figure what 15% or 20% is.