Zach Johnson grabbed his heart on the par-3 16th after hearing what sounded like a small explosion in his vacinity in the final round of the John Deere Classic.
The noise came as Johnson was preparing to stroke a birdie putt in chase of the win at TPC Deere Run.
Johnson got a drink of water and calmed down before missing the putt and settling for par.
Tournament security are saying the noise came from an air cannon fired from a boat located in the river adjacent to the 16th hole.
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