6. Phil Mickelson, 2018 U.S. Open

Phil Mickelson at the 2018 U.S. Open at Shinnecock Hills GC. (Photo: Dennis Schneidler/USA TODAY Sports)
In a moment of temporary insanity in the third round, Mickelson played hockey with his ball on the ultra-slick 13th green at Shinnecock Hills while it was still rolling (likely off the green). Mickelson had broken rule 14-5: “A player must not make a stroke at his ball while it is moving.”
He received a two-stroke penalty, but in the eyes of many, should’ve been disqualified for his actions.