Emily Blunt "passed out" when she was "charged" by a shark.
The British actress and her husband John Krasinski had a terrifying underwater encounter during their honeymoon in 2010 when they went scuba diving, even though the 'Devil Wears Prada' star was concerned about getting close to the creatures.
John recalled: "It's very scary... I know every shark looks like Jaws, but these really look like Jaws and they're huge...and they swim very close.
"Emily never wanted to learn scuba diving and I was like 'We'll never get into trouble with sharks.
"All of a sudden one broke off from the circle and started swimming behind us. I saw it and Emily didn't.
"He started to charge Emily, so my decision was 'If I spook her and she moves a lot, he might bite her.' I just let it ride."
The shark drifted past Emily - who has 23-month-old daughter Hazel with the '13 Hours' star - and when she realised it was so close, her spouse was left terrified by what happened next.
He told talk show host Ellen DeGeneres: "Air bubbles came out, she kind of passed out under water. All of her air just went to the top, it was pretty scary."
Thankfully for the couple, a sea turtle then came and cheered up the 32-year-old beauty.
John, 36, added: "A sea turtle that came up, I'm not kidding, put his arm around her and then started petting her head. He hugged her.
"It was like he knew she had had a bad day and was like 'Sorry about my buddy Terry, he gets real close on the flybys.' "