Ariya blocked a tee shot into a hazard and ran up the only triple bogey at the hole by anyone all week.
What might have been the most hard day of the 22-year-old's career ended with her winning Sunday's playoff against Hyo-Joo Kim and walking away $900,000 richer with a second major title. Confidence gave way to fear.
Jutanugarn, who now has two major titles, climbed three spots to No. 2, right behind South Korea's Park In-bee. Jutanugarn shot one-over 73.
As is the custom for LPGA winners, Ariya Jutanugarn found herself doused with water after the final hole.
After misplacing his form on that infamous occasion then losing an 18-hole playoff to Billy Casper the following day, Palmer didn't like talking about what happened. Later that year she won her first major, the British Open.
After a front nine 32 at Shoal Creek, Jutanugarn stood on the 10th tee with a seven shot lead, and it seemed the title was already a foregone conclusion.
Seven shots in front, nine holes left. Karrie Webb has a fight to make the cut, having played seven holes and is four-over-par for the championship. The rise from 10 consecutive missed cuts to mountain top came at warp speed. Jutanugarn had some wiggle room.
She also got to witness Jutanagarn's horror show at close range.
"He's like, 'Come on".
"I was definitely nervous, but not like I've been in the past", Smith said of heading out early with a share of the lead.
Shoal Creek kept hitting back.
The Thai, by contrast, made further bogeys on the 12th, 17th and 18th. Jason Day, who has never finished better than 15th at the Memorial, had another 68 and was three back.
Smith, who hails from Queensland, Australia, and resides in Orlando, is in her 12th year on the LPGA Tour, but has yet to win. "Maybe years ago when she won the last event on the Futures Tour to get a card at the end of 2008".
Even the smiles by design weren't really working.
"I just felt really easy", said Smith.
In the first use of the new two-hole aggregate playoff for USGA Open championships, it was Kim who gained the advantage after rolling in another monster putt for birdie on the first hole (No. 14) - while Jutanugarn made par.
Sixty feet from the flagstick with a pond looming not far beyond, she blasted a fearless shot that trickled within a foot of the cup. "After she become world No1 last time she struggled", explained the Jutanugarn Snr.
Tiger Woods hit the ball well enough to be up there with them at Muirfield Village, except for missing five putts inside 7 feet.
"We know little things that push each other's buttons, and as long as I don't do that we're OK", he said. "Not because I want them to play golf, but because I want them to have a good life", she told Golfweek. "I am really excited". I didn't hit a great shot into 13, and then holed maybe a 40-footer for birdie there.