SOUTHAMPTON, NY - JUNE 15: Phil Mickelson of the United States prepares to putt on the fourth green during the second round of the 2018 U.S. Open at Shinnecock Hills Golf Club on June 15, 2018 in Southampton, New York.

Unhappy Birthday: Twitter stunned by Mickelson's incredible mental gaffe

Dane Belbeck
8 years ago
Streeter Lecka / Getty Images Sport / Getty

It's Phil Mickelson's 48th birthday on Saturday, but after a bizarre incident on the back nine at Shinnecock Hills, it's likely a day the legendary golfer will want to forget.

Walking onto the 13th green at 4-over for his round, Mickelson blew a putt past the hole and shockingly ran after the ball to send it back toward the cup while it was still moving.

That instantly results in a two-stroke penalty, and led to Mickelson carding a 10 on the par-4. The five-time major champion's decision to blatantly break the rules of golf because he wasn't pleased with how things were going was stunning, and Twitter reacted accordingly.

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