Most of us know it's not a good idea talk on the phone in a library or smoke in a spa. In fact, it's just downright wrong!
But what about the less obvious examples of bad behaviour in public?
A new handbook by the social etiquette guru Debrett’s has just been published. It's a guide to what's appropriate and what would get you a ticking off.
These are the worst five offences:
1. The way we use mobile phones. According to Debrett’s it’s rude to look at your phone when with someone, it should never be used whilst eating meals (that means no food porn!) and while paying for things in shops.
2. Smoking e-cigarettes at work. Debrett’s say someone should never smoke in the workplace as it shows you’re not focused on your work.
3. A kiss on the cheek? It’s not appropriate in many professional situations apparently - stick to a high-five, then!
4. No more make up on the tube - eating smelly food is no longer the rudest thing you can do on the tube as, apparently, applying make-up on the go can jeopardise people first impression of you, as it looks disorganised.
5. Reclining your seat on aeroplanes. No brainer. Debrett’s say it is selfish to recline on short daytime flights. But what if the person in front does it? It might be one squished journey!
Here’s what the Not the One show panel had to say on the matter.