Speaking of waiters, many people don’t treat their server right when dining out. Not leaving a tip — or tipping cheaply — is one of the rudest things you can do at a restaurant. Tips are where restaurant servers make most of their wage. And since many restaurants pool their tips at the end of the night, by skimping on one server, you’re punishing the whole staff. If you’re not sure how much to tip, here’s a comprehensive guide to tipping in almost any situation.