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Denzel Washington
The versatile actor reportedly turned down a role in Dreamgirls (2006) because his singing chops weren't up to snuff. The job was snapped up by Jamie Foxx, whose masterly portrayal of Ray Charles two years earlier won him an Oscar. Sure, a great actor must know his limits, but was it worth missing out on a film that won two Academy Awards and brought in just over $100 million at the box office?
