The parents reacting to their children's punishments. Yes, it's mostly their fault for spoiling them all, but still, to watch your young child be sucked up a chocolate tube or turned into a giant blueberry is incredibly horrifying.
The Original Novel
After the first four tickets are gone, Charlie's family nearly starves to death. Even when they arrive at the factory, Grandpa Joe and Charlie are described as bony and skeleton-like (especially Grandpa Joe).
The 2005 Film
To stop the theft of anymore of his recipes, Wonka decides to close his factory. When he's informing his workers of this, he lets out a soft and heartbroken "I'm sorry" as the gates close. Considering Grandpa Joe likely wasn’t the only innocent one, it’s particularly sad.
Charlie telling his family that they should sell the ticket because "we need the money more than we need the chocolate."
After threatening to run away, Willy returns home later that day to see that his father kept his promise to not be there if the boy came back: the man and their entire house is gone, leaving a stunned Willy to stare at where the building used to be.
Charlie turns down Willy Wonka's offer to move into the factory because he didn't want to leave his family.
At the end of the movie when Willy Wonka and his estranged father are reunited. Also Heartwarming.
After Violet and her mother leave the factory, Violet tries to look on the bright side by pointing out how she's more flexible now, to which her mother shuts it down saying she's blue, and Violet actually looks saddened by this. Even if this Violet Took a Level in Jerkass, her Unintentionally Sympathetic qualities were not all erased.
The 2013 Musical
After the fourth ticket is found, Charlie has a Heroic BSoD as his hopes are shattered. As he's encouraged by his dad to make a wish on a star, all he can say is "Don't waste a wish on me," showing how much he had given up hope. This leads into "If Your Mother Were Here," in which Mr. and Mrs. Bucket sing about how the other would do a better job at cheering up Charlie.
The 2017 Musical
Mr. Wonka opening the musical by saying he must go out into the world to find an heir. Then he hesitates because he hasn't been outside in 40 years.
The song "If Your Father Was Here" where Mrs. Bucket tucks Charlie into bed after he despondently says he'll make his birthday candy bar last a year. She says his father was a dreamer and dances with a ghost version of him.
