Emma Watson has revealed she struggles to play angry roles.
The Harry Potter actress - who stars in a good girl, bad girl photo shoot for the cover the August issue of UK Harper's Bazaar magazine - said it scared her to let out the emotions she keeps bottled up.
Emma said: "My acting tutor said the hardest thing for me was to get angry.
"I almost broke down in tears when they tried to get me to be angry. I said, 'I can't do it, I just can't do it.' I keep all of that really bottled up somewhere and I feel unleashing it would be the scariest thing - and to let myself be powerful, sexy, all those things, it's scary for me.
"[Even playing the bad girl in this shoot] felt a bit uncomfortable and awkward, it didn't come naturally at all."
The 21-year-old actress has played good girl Hermione Granger in the Harry Potter films for the last ten years, and admitted she has always been well-behaved herself.
She said: "There has never been room in my life for that [rebellion] - I couldn't imagine giving my family any more trouble, it's already been complicated enough.
"My dad is one of the top international-communications lawyers in the country, and trying to argue with him was a nightmare, so I learnt quite quickly to be good with words. My mum is an incredible woman. She moved back from Paris with my brother and me after the divorce, and worked full-time, supporting both of us. But I felt I wanted to take care of her - I didn't want to give her a hard time."