“Nice show Ms Swift, there’s a tenner for you, maybe buy something nice with it”

This one, every time. Imagine buying a product or service for an agreed price, and then being guilt-tripped into having to pay 20%, or more, on top because the owners don’t pay their staff enough salary to survive on. It should be fucking illegal. Pay your staff a proper salary and charge your clients the price you published on your menu/price-list etc. Running a business isn’t a god-given right, and if you can’t do it without screwing your employees over, then you’re not capable of running a business period. You should bugger off and let someone who is capable, and who isn’t an empathy vacuum have a go.