I've seen this movie like ten times and that rant at the end still gets me. The way his mood turns on a dime after Wilder has been playing Magical Tour Guide for an hour just hits you like a ton of bricks.
And then again when, Charlie having returned the gobstopper, Wonka tells him that he has won. So powerful. I probably should have submitted a clip with that part, but I couldn't find it in my rush. Here it is: https://www.youtube.com/watch?v=HgVS1OhucbI