My God, What Have I Done? is a god-tier trope tbh

There’s just something about watching a character come to the realization that they’ve just said and/or done something terrible, and it works no matter how they realize it. Whether the realization is immediate or delayed, sudden or gradual, it all demonstrates the character’s shock.

I especially love it when the realization triggers a physical reaction - things like the character collapsing in shock or hastily backing away from another character. But it can be just as effective when the character freezes in place, unable to come to grips with having done something that completely contradicts their morals.

It’s just a really really good trope.