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Aaron Eckhart, Nicole Kidman in “Rabbit Hole” grief

How much is too much when actors research their roles?

Actor Aaron Eckhart, who plays Howie Corbett in John Cameron Mitchell’s “Rabbit Hole,” said he may have gone too far to research his character.

“I did attend one bereavement class and that was probably unethical, I would have to say, because you really feel like you’re taking advantage of people who are laying it all out … you just feel like you’re a liar so I didn’t do that again,” he told reporters at a press conference during the Toronto International Film Festival.

“Rabbit Hole,” based on the Pulitzer winner play by David Lindsay-Abaire, is an intimate story that focuses on a couple grieving the loss of their young son.

Eckhart, known for his slick roles in “The Dark Knight” and “Thank You For Not Smoking,” said Internet video blogs work well for such raw emotions.