One of the essential golden rules of golf is that, as a spectator, you don't distract golfers while they're on the green. You keep your voice down and let them stay focused while they do their thing.

If you're a fan looking to pull off a practical joke during a PGA Tour event, make sure Rory McIlroy isn't around to interrupt it. Per Adam Schupak of GolfWeek, a fan walked onto the course during the ...