Kidman, Eckhart fell out during `Rabbit Hole` shooting

London: Aaron Eckhart, who plays Nicole Kidman`s husband in `Rabbit Hole`, says that they did not share an easy equation on the movie set and "irritated" each other.

Eckhart blames their irritability to the disturbing subject of the movie, about grieving parents of a dead child.

The film is being named as one of the Oscar contenders next year but Eckhart says he had a difficult time grappling with the story. The actor says he prepared for the role by taking part in a group counselling session with real life victims of family tragedies, Contactmusic reported.

The `Dark Knight` star admits the sad story made life on set "uncomfortable" and he fell out with Kidman as they worked on their parts.

"She was irritated with me and I was irritated with her but that`s the way movie-making is. For one day, are we not allowed (to fall out)? For half a day even?... It`s so surprising to me when people are surprised that movie-making is sometimes tense and uncomfortable because inherently it`s going to be.

"You`re around tens of people or hundreds of people working on things that are imaginary and that come from the soul. You could be dealing with subject matter like prostitution, death, drugs, blah, blah, blah. How could you expect that not to be uncomfortable?," said the actor.