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Do you apply your lipstick on your morning commute? Or perhaps you use your mobile phone when out with friends?
Either way, we have it under good authority that what you're doing is wrong - it's not proper, dahling. (Although don't worry, we thought some of these were relatively acceptable procedures in daily life, too).
To clear up any confusion you might have, the experts in modern manners Debrett's have shared their much-esteemed guidance.
Ladies and gentlemen, an education in etiquette awaits...
The Debrett’s Handbook is out now. For more information visit www.debretts.com.