Director Christopher Nolan showed up on Michael Caine's doorstep to offer him the role of Batman's butler Alfred, and refused to leave his side while he read the script - to ensure the movie legend couldn't leak details.
The veteran plays the Caped Crusader's right hand man in Nolan's three-part reboot of the superhero franchise, and he reprises his role in the upcoming The Dark Knight Rises.
And Caine admits he was shocked by the moviemaker's top secret efforts.
He tells the Sunday Mirror: "The director Chris Nolan is the most secretive guy. The first time he came to me for Batman he came to my house in the country on a Sunday morning.
"I opened the door and he was standing there with a script. He said, 'Do you want to play the Butler?' He stayed while I read it and took the script away. He wouldn’t trust me with it!"
Caine might not agree with his director's trust issues, but he has enjoyed working with Nolan on the three Batman films and he can't wait for fans to see the new movie: "This one will definitely be the best (Batman film) ever."