Kids Huh.

A family beach outing turned terrifying when what was thought to be a washed-up buoy turned out to be an active bomb.

"My children took their boogie boards down and we were going out to the sea," Kelly Gravell of Burry Port, Wales, said. "We saw a large object on the beach, so we thought we’d have a little look.

"We get things washed up all the time, so we thought it was a buoy. We never thought for one second it was a bomb."

The children, Ellis and Erin, climb on a barnacle-covered object at a beach in South Wales. Local officials said that the object originated from the United States.

Gravell told ABC News she, her husband, and two young children went to their local beach for a picnic on Aug. 12, when the kids noticed something wash onto the sand.

That's when, she said, Erin, 6, and Ellis, 4, began posing for photos with the huge metal ball.

"We were more fascinated by the barnacles on it," Gravell added. "My son was touching it and was knocking on it a little bit, and that was it really."

Kids Huh. Just a thought.

[Nicole Pelletiere via Good Morning America]