Just a lighthearted one but also something I've noticed and found very rude and selfish...
When standing in the queue for a checkout and a new till opens, have you noticed how people behind you rush forward to get there first? So, say you're 3rd in line, 4th and 5th take no heed of you being in front and being priority to be served at the newly opened one.
When I'm behind them and they're getting their trolley to move I beckon them to go in front as it's polite and fair. Have never had that reciprocated, just full on push and rush in front with no eye contact.
As I said, lighthearted, just one of the many poor etiquettes practised by most people with strangers.
Don't even get me started on drivers lol 😒 🙄 😂