Please don't list this on a work's page as a trope. Examples can go on the work's YMMV tab.
Tear Jerker: Speak
Melinda becomes a great big woobie once you realize why she's so quiet and isolated. Everyone hates her for what she did at the party, and Andy (the cause of her suffering) is the jerkass of all jerkasses to her, knowing quite well that she's near-mute.
And then it comes full circle when Andy decides for a round two.