What's the most WTF scene in an otherwise normal movie?

Last night I was watching Willy Wonka and the Chocolate Factory with my nephew, and overall it's a pretty kid-friendly movie.

However, I forgot about one particularly creepy boat scene in the factory.

For some reason, after exploring the wondrous chocolate room, Wonka takes the group on a satanic boat ride through hell. This thoroughly creeped my nephew out and he asked me to skip it.