Facts and Celluloid
“Michael Madsen had difficulty filming the torture scenes due to his strong aversion to violence of any kind, and was particularly reluctant when he was required to hit actor Kirk Baltz. When Baltz ad-libbed a line that his character had a child at home, Madsen, who had just become a new father himself, was so disturbed by the idea of leaving a child fatherless that he almost couldn’t finish the scene. This take made it into the movie, and in some versions of the film, you can clearly hear someone, possibly Tarantino himself, utter “Oh, no no!” off-screen.”
via IMDb
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