Related Clues:

• Forbidden things
• Some rules
• Part of an etiquette list, maybe
• Things frowned upon
• Fashion faux pas list
• Do's and --
• They're forbidden
• Half an etiquette list
• List of faux pas
• Inadvisable acts
• The gauche half of an etiquette list
• Some etiquette tips
• Taboo activities
• Do's and —
• Actions to avoid