During the final round of the John Deere Classic, American Zach Johnson was putting for birdie at the par-3 16th hole.
A boat on the nearby Rock river was the culprit, letting off a loud banging noise just as Johnson was in his putting backstroke.
Johnson, who finished tied-third at TPC Deere Run, eventually putted for par.
“I don’t know if it was like a pipe bomb or backfire from a boat, I don’t have any idea, but I know it was loud,” explained Johnson.
“I know I was about ready to hit my putt, and I mean, you know, it was 35 feet.
“It’s not like I was hitting a tap-in or eight-footer or one of those things.
“But unfortunate, but as a golfer, I guess as an athlete, you gotta regroup and just kind of get back in it mentally and fortunately I did okay.”