It's the sound that makes you wince.
The shuddering crack of a golf ball hitting the spectator right on the skull.
Rory McIlroy didn't have a great time at the Memorial tournament.
The Holywood golf star missed the cut on Friday in Ohio, USA.
And this erratic shot pretty much summed up his day.
It came at the seventh hole, McIlroy slicing his drive wide right into the crowd.
And for one unsuspecting fan, it would land square on the top of his head.
As this footage shows, it was some crack, too:
Fortunately, the fan didn't seem badly hurt by the time McIlroy made it down to him, with the four-time major winner apologising.
Keep up-to-date with all the very latest news, what's on, sport and everything else in Belfast and beyond with the Belfast Live app.
Only select news that interests you by picking the topics you want to display on the app's homepage. Plus, our enhanced user experience includes live blogs, video, interactive maps and slick picture galleries. Download it now and get involved.
Click here to get it from the App Store or here for Google Play .
