The main character getting slapped down for their nonsense.
Maybe he's touting ridiculous standards of morality, maybe he's being hypocritical but refusing to see it, maybe he's drunk on power and bites off more than he can chew. But someone or something comes along and just beats him down (or crushes his argument, etc). He is so thoroughly defeated that even recovering is a faint hope, let alone retaliating. His inappropriate view of the world is crushed in the most direct, irrefutable way possible and he can't deny it.
This comes to me after so many works where the main character's flaws are excused by plot contrivance, or through author favoritism, or by simple narrative incompetence. Anime, manga, fictions of all type suffer from "heroes" who believe absurd things and try to force their way, somehow winning despite not deserving it. I like to see these characters wrecked, and forced to acknowledge that they were wrong and need to change.