This is based on opinion. Please don't list it on a work's trope example list.
Tear Jerker / Thirteen Reasons Why
Clay's thoughts during the thirteenth reason. He's begging the teacher to just stand up and help Hannah, to not simply ignore her pleas for help. But the Foregone Conclusion makes it very clear that he won't help her.
One of Clay's main roles in the story is really to increase the gravity of the massive Tear Jerker that is this book.
At one point when he's in the local diner that lead to one of Hannah's reasons, his waiter gives him a free meal after seeing the expression he had on his face after having listened to the tapes.
The very last tape. Tape 7, side B. The one that supposedly had nothing on it. Nothing but static for a few minutes, and then, Hannah's voice, whispering, "Thank you."