https://www.youtube.com/watch?v=5foZtHjW46U

Brit Marling is a great actress with many talents who currently stars in "The Keeping Room," but she has another, well, skill, too.

"I can make a bump key," she reveals to James Corden on "The Late Late Show" on Wednesday. "A bump key is a key that you file down and you can stick it in any lock and hit it with the back of a butter knife and turn and open any door."

To master the skill, she turned to an unlikely group.

“I was hanging out with a group of anarchists, and one of the first things you learn in an anarchist community is that you can unlock anything," she explains. "No door is closed to you."

Before you know it, you could have a secret key.

"You can file down any house key," she says. "I shouldn't be telling you this, but you can."

She admits that "it's complicated" to infiltrate an anarchist community, but there is a way.

"You can start with train hopping. So first, you just have to know how to hop trains," she says. "It basically means, you know, being able to ride the rails without paying for it. So you just have to learn to hop in the back of the cargo part of the train and travel."