Related Clues:

• Using metallic dishes in a microwave, e.g.
• Do the wrong thing
• Bad bad leader?
• Cell phone ring in a theater, e.g.
• It's frowned upon
• Smacking one's lips while eating, e.g.
• Forbidden action
• Elbows on the table, e.g.
• Roving eyes on an exam, e.g.
• Greed, envy or pride
• Iniquity
• Don't
• Moral lapse
• "___ Nanette"
• Break a Commandment