Wizard of Oz Fact #78: The Wicked Witch’s Scream Was Added in Post‑Production
Margaret Hamilton’s chilling scream during her melting scene was not recorded on set. Instead, sound engineers enhanced her performance by layering additional vocal effects in post‑production. The combination of Hamilton’s acting and the eerie audio design helped make the Witch’s demise one of the most unforgettable moments in the film.
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Source: Good Housekeeping