In the 1968 Augusta Masters, Roberto De Vicenzo signed his card with a par instead of his real score -a birdie, for the 17th hole. That "extra" stroke prevented him to tie for the first place with Bob Goalby, who was proclaimed champion. People were confused and astonished. De Vicenzo's quote afterwards became famous for its simplicity: "What a stupid I am!"

De Vicenzo was a serious candidate, he had won the British Open the year before, defeating Jack Nicklaus. He often says that Goalby and him will have their play off at heaven.

Golf and the Rules of Golf are the same thing, so there's nothing to criticize except for one thing: at that time players exchanged score cards, so De Vicenzo's card had been actually filled in by Tommy Aaron. I understand that pros don't exchange cards anymore but I'm not sure. Amateurs still do it here in De Vicenzo's country. It's not a good practice IMHO because it increases the chance of errors when players have to keep track of two scores at the same time.