Boris Karloff famously narrated the Dr. Seuss classic, How The Grinch Stole Christmas. But the horror film veteran had a little secret—he couldn’t sing. Instead, the production team called on voice actor Thurl Ravenscroft to handle the musical numbers. Ravenscroft’s singing was unknown for years, because he did not receive a credit on the telecast, leading many to believe it was Karloff who knocked the song out of the park.

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