Break The Vase

IOUGHTTOKILLYOUFORTHATYOUSONOFABITCH

When someone unintentionally does something that greatly displeases another person upon meeting them for the first time. For example, Guy walks into Ava's house after being invited by her for a day of casually hanging out and accidentally obliterates something Ava holds dear. Either Ava evolves into a Rage Beast, has a Good Times Montage involving memories she had with that item, or commences Gradual Loathing. This is a very largely played reason for why one character (likely an antagonist or at least made out to be one) hates or fights against another. On top of that, it's one of the most played UnTrashes in fiction history. Most of the time when someone Breaks The Vase, they goof and make that other person hate them and want to destroy them.

Contrast to Break The Vase And Laugh where the destroyer intends to grief their victim after their first encounter.