Then again, they are professional actors, so maybe they're just hiding it!

Matthew McConaughey and Naomi Watts premiered The Sea of Trees at the Cannes International Film Festival over the weekend, and the film was met with boos from critics!

In the movie, McConaughey plays a man mourning the death of his wife, who travels to a "suicide forest" in Tokyo to end his life. Once he gets there he runs into an injured local trying to get out of the wilderness, so he helps the man and somehow finds a will to live. Now we're really curious about this one! How bad could it possibly be? Worse than Mud?

While McConaughey admitted that he was unsure of himself during filming, he is proud of the project. "There were many times during the making of this where I thought, 'I don't know what I'm doing,'" he told reporters. "That frustrated me for a long time." The Oscar winner added, "I like the film. I'm happy to be here, happy to be invited. Happy that the film got in."

So what about being booed? "Anyone has as much right to boo as they do to ovate," McConaughey said at a press conference on Saturday. We love that he has such a good attitude about it!