Rory McIlroy called the situation "amateur hour". Jordan Spieth said it was a "joke". Rickie Fowler opted for "laughable". There was no reason to disagree.
In a controversial and somewhat baffling decision, the USGA informed US Open winner Dustin Johnson on the 12th hole that a would-be rules infraction from seven holes earlier would be reviewed after Johnson's round, whereupon he could be assessed a one-shot penalty had the potential to change the result of the championship. Fortunately, it didn't.
On the fifth green, Johnson took some practice strokes, then floated his putter behind the ball for an instant, whereupon the ball barely, almost imperceptibly, moved. Johnson called in a rules official and seemed to state that he didn't ground his club, which would have resulted in a penalty had the ball moved after getting set.
The rules official agreed that Johnson hadn't grounded his club and the incident was forgotten until a USGA official informed Johnson on No. 12 that there would be a review of the situation after the event. At the time, Johnson, who had a rules violation that cost him a chance at the at the 2011 PGA Championship, was up two strokes.