Why do people get annoyed when someone blocks the escalator?
Invisible rules can trigger visible emotions.
People become annoyed because shared spaces create unwritten expectations about movement and courtesy.
Nobody explains escalator etiquette. Yet almost everybody expects it. The hidden mechanism is spontaneous norms. Humans create invisible rules to reduce friction. Breaking them feels unfair, even if no official rule exists. People think etiquette is taught. Very often, it emerges naturally from repeated interactions.
