Because Michael Mann's similar note encouraged him to keep going. During The Hollywood Reporter's Director Roundtable, The Hangover actor revealed that the rejection letter he received after trying out for Mann's 2009 movie Public Enemies inspired him to keep pursuing his dreams. Because the note had such a huge impact on him, Cooper adopted Mann's practice when he became a director with A Star Is Born and Maestro. Bradley told his fellow directors, including Mann, "I put myself on tape for Public Enemies years ago, and I didn't get it…”