So I manage a store in Stockholm and I have quite a few stories to tell, but this one comes from my old grandmother (97!!) who used to own and manage a small local grocery store with my grandfather about 50-65 years ago. Naturally she doesn't remember the dialogue perfectly but the essence is what is important here.
Their store was located in what was a posh area, a district in Stockholm where, at the time, a lot of fine folk used to live. (lawyers, judges, doctors etc) Back in those days a lot of men had stay at home wives who, sometimes, were a bit spoiled and were often a bit self absorbed.
One day one of their regulars came in and bought a can of pea soup. (she wrote it up on her rather large tab) Two days later the same lady storms in with a pot in hand, containing pea soup, and a very angry expression on her face. She confronts my grandpa:
Pea lady: This soup is absolutely horrible, it tastes disgusting!!
Grandpa: Well it seems that you burnt(you could smell it from the pot) it while cooking, pointing at the pea soup in the pot. It won't taste very good if you burn it.
Pea lady: I did no such thing! Its something wrong with the soup, I want to be compensated!
Grandpa: I can't give you any compensation for the soup (it was a standard can from a well known brand), nothing is wrong with it, you burnt it yourself.
Two days later the lady calls up the store and says that she wants to make right for herself and wonders how much her tab is. My grandma walks over to her house (she lives close by) to settle it:
Pea lady pays her tab then starts screaming and shouting that the soup was bad and they will be sorry (basically a longer version of what happened in the store)
Grandma: grabs pea ladys arm be quiet! Are you cooking right now? It smells like something is BURNING! (you could see smoke coming out from the oven)
Pea Lady(Screaming): Well if the dinner is burnt its YOUR fault!!! Slams the door in my grandmothers face.
Two days later she is back in the store shopping like nothing ever happened.
Tldr; Crazy Lady cant heat up soup, comes to the store with pot in hand for justification!