John Krasinski opened up on a pretty frightening encounter that he and his wife had on their honeymoon.

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On Friday, the actor made an appearance on The Ellen DeGeneres Show where he mentioned that on his honeymoon, he and his spouse Emily Blunt, went scuba diving. Little did they know they would come close to a shark.

Krasinski admitted that he loves to "terrify" his wife, which is how things got crazy when they were 100 feet underwater.

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"It's very scary," the actor said. "We have a disposable camera that I was videoing on and it started to crinkle up. No joke. It was pretty wild, and the crazy thing was the day before we had snorkeled with sharks and so our dive instructor, I think, got really competitive so he's like, 'Oh, I'll show you some stuff,' and I said, 'I don't need you to show me. We saw. It's good,' and he was like, 'No, we're gonna take you to gray reef sharks.'"

When he saw these sharks, he said they're "huge" and "really look like Jaws." And of course, they were in super close distance to himself and Blunt.

"Emily never wanted to learn scuba diving and I was like, 'We will never get into trouble with sharks,' and all of a sudden one broke off from the circle and swam behind us, and I saw it and Emily didn't," Krasinski said. "And he started to charge Emily and so my decision was if I spook her out and she moves a lot, he might bite her and instead I just let it ride."

This is when the shark came close and Blunt seemed to have a pretty logical reaction.

See what Krasinski said about it at the 1:42 mark.

Tags: John Krasinski Emily Blunt