Dakota Johnson suffered whiplash while filming 'Fifty Shades of Grey'.
The 25-year-old actress - who stars in the upcoming erotic drama film alongside Jamie Dornan, who plays controlling businessman Christian Grey - admits there were "some painful moments" on set when the pair were acting out some saucy scenes.
She said: "I got whiplash once from him throwing me on the bed; so f***ing painful. And I wish we had a gag reel from the shoot. One time we were doing a scene in Christian's kitchen, and I [thought it would be funny] to hide in a cabinet. I pulled the handle, but it was not a real cabinet. The entire set cam down on me."
But Dakota - who plays innocent student Anastasia Steele - admits her injuries helped break the tension on set during intense S&M scenes.
She said: "The fact that I could laugh with [Jamie] was nice. Sometimes I did walk off the set feeling a bit shell-shocked. The drive home from work always helped me snap out of it. And a big glass of wine."
The actress is very proud of the film and is looking forward to its release, but doesn't want her family, including mother Melanie Griffith to watch it.
She added to Glamour magazine: "My mom came up for a day [during filming]. She's proud of me. But I don't want my family to see [the movie] because it's inappropriate. Or my brothers' friends who I grew up with."
Jamie, 32, also isn't sure if he will let his newborn daughter with wife Amelia Warner see the film when she is older.
He said: "When my daughter's 18, I'm not going to go, 'You've gotta watch daddy in 'Fifty Shades of Grey.' But there will be greater things to protect her from than seeing dad's arse on the big screen."