while at a restaurant
When a waiter removes a finished plate while someone is still eating! Uh hem, DO NOT REMOVE anything from the table until everyone has clearly stopped eating.
When the waiters asks "would you like change?" How rude to assume that the extra money left isn't because we'd like change but because uh huh,we like to tip 2000 percent!. Cha-ching! Ya, that's the sound of your tip going down.