Actor Aaron Eckhart has said he experienced ''rage'' for years after playing baddies in movies.
Speaking to the New York Post, the 45-year-old actor said: ''Acting those rough roles means research. I stayed in that place of animalistic rage for years.
''Life is not all black and white. It's complicated. We're complicated human beings. Even if Aaron's a good person, all that other stuff is part of being alive.''
However, Eckhart insisted that he's looking forward to playing the monster in I, Frankenstein.
Aaron further explained that he can relate to his complex character, saying: ''We're damaged, flawed and trying to learn from it. No rhyme or reason to many things we do.
''It's part of what happens after you're born. Sometimes one part comes out, sometimes another and you put that other part back in.
''On Earth, everyone needs someone. We all want to be included. And so does this particular character I play.''
When asked about the monster costume, he added: ''Every day it took three hours in the makeup room putting the stuff on. Making scars and stitches. Sticking wigs on. Looking in the mirror, you'd think, 'Oh, God' then you'd rip it all off in 10 seconds because you wanted to get home.''