WARNING: This post "spoils" an early quest in Fallout 4 and a later quest in Fallout 3.
The "Diamond City Blues" quest, one of the better quests of Fallout 4, begins at an upper-class bar in Diamond City. Most of the bar patrons are snooty rich one-percenter caricatures who will categorically refuse to talk to poor people like you, even though you're richer than God and they literally sleep on filthy mattresses in trash shacks, so you basically kind of hate these people from the beginning.
Over at the bar counter, a woman is drinking to forget her unhappy marriage, while the grizzled bartender-owner dude implies he's having an affair with her. Suddenly, her weak jealous husband tries to confront the two but he ends up getting humiliated.
When you run into the jealous husband again, outside of the bar, he wants to hire you to help confront the bartender. So you go back to the bar...