Glaswegians are friendly and hospitable, but it is important to follow local etiquette to show respect. It is polite to say "please" and "thank you" when dealing with others, and to use formal forms of address unless invited to become more familiar. When dining out, it is customary to leave a small tip for good service. Smoking is prohibited in all enclosed public places, and littering is strongly frowned upon. When entering a pub, it is polite to wait for the bartender and not sit at a table.