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
One of Mr. Salt's employees finds the ticket. In a heart-wrenching scene, she attempts to hide the ticket but gets caught doing so and is forced to give it up.
At the end of the movie when Willy Wonka and his estranged father are reunited.
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.
There has been some tributes. Some fan arts for the tribute to the late actors David Kelly (2012; Grandpa Joe) and Christopher Lee (2015; Wilbur Wonka). As the characters mourn the loss.