Jem feeling mighty awful that the hole that Boo has been leaving gifts and treats in has been plugged up by his brother. To Scout, it means the end of gifts while Jem as a bigger grasp on the cruelty toward Boo.
A good place to start would be "Stand up, Miss Jean Louise, your father's passing." Also counts as a Heartwarming Moment.
Another is "Hey, Boo." So much said in just two words.
And "Can you take me home?" from Boo to Scout. The idea that a grown man actually needs a little girl to take him from one house to the house next door because he can't go alone.
Just think about him and start weeping.
The ending when Scout stands on the Radley porch and sees the events of the book from Boo's point of view. There's just something so beautiful about that moment.
"In the name of God, do your duty."
"I don't know, but they did it. They've done it before and they did it tonight and they'll do it again and when they do - seems that only children weep."
The film: Scout talking to Mr. Cunningham in the lynch mob, when the black community stood up as Atticus left the court room even though he lost the case, and when the reverend told Scout to "stand up, miss Jean Louise, your father's passin'", when Atticus receives the news that Tom Robinson has been killed and tries to convince himself the deputy sheriff didn't murder him, when Tom's father slouches into the house, moments after hearing his son is dead, being ordered around and called 'boy' by the man primarily responsible, and when Atticus, a man so fiercely protective of his children, trusts Boo Radley, a mute shut-in with a violent reputation, enough to leave him alone in a room with Scout and an unconscious Jem.
Atticus' speech about Mrs Dubose, that horrible, racist old woman, calling her the bravest person he'd ever known for having the courage to die free of her morphine addiction.
"It just makes you sick, doesn't it?"
Raymond: Things haven't caught up with that little one's instinct yet. Let him get a little older and he won't get sick or cry...Cry about the simple hell people give other people—without even thinking. Cry about the hell white people give coloured folks, without even stopping to think that they're people, too.