Russell Crowe warned Douglas Booth that working with him would be the most "interesting" thing he ever did.
Booth ran into trouble with his 'Noah' co-star because he spent so much time on the set of the blockbuster texting his then-girlfriend, but following the telling off, he now leaves his phone in his trailer.
Douglas said: "I was on set in New York and always on my phone texting and I remember Russell coming up to me and saying, 'You're never going to be doing anything more interesting than working with me and [director] Darren Aronofsky. What are you doing on your phone?'
"And he was completely right. Now my phone doesn't come on to set so I stay present in every moment."
Douglas - who previously dated actress Vanessa Kirby and has also been linked with Taylor Swift, Emma Watson and Cara Delevingne - has just finished filming 'Pride and Prejudice and Zombies' with Lily James, Matt Smith, Suki Waterhouse and Sam Riley and found working on the comedy a "pleasure".
He told Britain's Marie Claire magazine: "Some movies are a slog to get through.
"Sometimes you think, Why are we all here? Slogging these long hours, going through hell, but you do it because you're making something wonderful and you're immensely proud at the end.
"We all hung out and had a wonderful time. It was a pleasure to go to work every day."