Although she is one of the world's biggest pop stars, Taylor Swift is merely human and she has fears like the rest of us. As Billboard notes, the singer stopped by The Ellen DeGeneres Show recently and talked to the host about her deepest fear: sea urchins. She also dished on Adam Levine's weakness.

"If you knew what sea urchins were, you would be terrified of them," Swift told the audience.

DeGeneres began to describe the sea critters to the viewers, saying they sit at the bottom of the ocean "minding their own business" when Swift interrupted.

"No they're not! That's the thing," she said. "They're like a grenade. They're sitting there waiting to completely injure you."

Swift continued to tell the audience what happens if you step on a sea urchin.

"You could lose your foot. You could lose your hand. You could lose your hand trying to get it off your foot," she said as the audience laughed.

Check out the visibly unsettled Swift below:

DeGeneres also asked Swift about her time as a mentor on NBC's The Voice.

"It was so much fun because I got to spend all this time with all the coaches who are incredible artists," she said. "It was a blast. I had no idea what to expect and I loved it so much."

Swift went on to say that as a mentor, you get to learn a lot about the celebrity judges, who include Gwen Stefani, Pharrell Williams, Blake Shelton and Adam Levine. According to Swift, Levine's only weakness is Broadway tunes.

The singer explains it in detail with a snippet from Rent below:

The singer's new album, 1989, is due out Oct. 27.

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