Michael Fassbender admitted he liked to mess around between takes while playing Mr Rochester in Jane Eyre.
The Hunger star played the brooding hero opposite Mia Wasikowska in Cary Fukunaga's new film adaptation of Charlotte Bronte's novel, and he liked to have fun when he wasn't in character.
Michael revealed: "I kind of like to do that. Especially when you're dealing with a period piece or a heavy piece that is dealing with Victorian England.
"At the time there are certain etiquettes that you have to incorporate and respect but you don't want to get bogged down by them and I like to go into a scene relaxed and lose, and if you've got a partner who's comfortable and confident to allow that then you can discover things.
"You want to keep yourself as aware as possible and as open as possible and see what happens together. And if you have a good spark going into the scene, then you carry that energy into the scene."
The Irish actor admitted it was hard work taking on the role, which has previously been played on screen by Orson Welles among others.
He said: "It's a challenge even without the fact that it's been done so many times and by so many great performers, just that you do justice to the character.
"He's so dense and so complicated, and he's carrying so much past along with him, you want to convey that physically as best as possible, as well as his state of mind in terms of his mood swings."
:: Jane Eyre is released in cinemas on Friday September 9.