The Wonkatania boat in Willy Wonka's amazing chocolate room looked magical on the silver screen, piloted by an Oompa Loompa captain in the Chocolate River.
Except- the boat was actually on a track, operated from a central control room. The director of the film didn't tell the actor that the boat was not being operated by him, so that he would give a more realistic performance. The scene was difficult on the actors because the watery chocolate mixture had spoiled, making the set smell terrible.
