‘Black Swan’ actress Winona Ryder has confessed she found it difficult to yell at fellow star Natalie Portman on set. In the film, a thriller about ballerinas, Winona’s character verbally abuses Natalie’s character, but the actress went out of her way to apologise after the tense scenes. “I wrote to Natalie and got her something when I had finished filming, saying, ‘I’m so sorry I had to say all those horrible things,'” says Winona. The 39-year-old also admitted she struggled with some of the more violent scenes. “The scene where I trash my dressing room was my last scene. I remember my first boyfriend used to smash everything – at 18 everything is dramatic. once I took an Evian bottle, and tried to break it really meekly and he made fun of me. Even in that dressing room scene I was like, ‘Sorry! Sorry! Sorry!'”