A teenager managed to stop an empty runaway boat going round and round in circles on Lake Winnipesaukee in New Hampshire.
A video filmed on Wednesday shows the moment 17-year-old Brady Procon jumped from a jet ski onto the moving boat and cut its engine.
Rich Bono, who captured the video, said he later learned that the boat’s operator, a sailing instructor, had reached into the water to pick up a tennis ball used for a lesson, when one of the students’ sailboats tipped over.
The sailboat’s mast struck the motor boat’s throttle, sending the instructor overboard and the boat into a spiral.
Brady, who is joining the US Navy in the autumn, told WMUR-TV the experience had been both scary and fun.
“I’d do it again,” he said.