Do you always leave at least a 15% tip in a restaurant?

That no was a bit too strong. I often do round up the bill for waiters and waitresses who offer information beyond the menu and those who improve my mood by making jokes or being kind. For more than half of cafe visits this is the case, so I do tip more often than not. But I don't bother with percentages and don't feel guilty to only pay for my food and drinks when that's all I get because a living wage for personnel is already included in that price.