Robert Downey Jr (Tony Stark/ Iron Man) attending Marvel Avengers

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Robert Downey, Jr attends The Avengers Premiere at BMCC/TPAC theater in New York City, NY, USA, on April 28, 2012. Photo by Donna Ward/ABACAPRESS.COM Stock Photo - Alamy

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Robert Downey Jr says his 'best work' as Iron Man 'went a little