Pygmalion (1938)
The scene in which Eliza accidentally swallows a marble whilst having an elocution lesson does not appear in the original play. During rehearsals for this scene a pained expression came over Wendy Hiller’s face; when she spat out the marbles she had in her mouth she said: “Leslie, I’ve swallowed one!” to which Leslie Howard replied “Never mind there are plenty more”. This caused such amusement among the watching crew that it was added to the film.