See this:
1992 Million Dollar Challenge
Two big disqualifications changed the total scope of the tournament, which is famous for awarding a million dollars to the winner. The first came in the third round when Nick Faldo was disqualified for signing an incorrect scorecard. At the time, he was six back of the third-round leader and was awarded last-place money of $105,000, a lot less than if he could have earned with a solid final round. The other disqualification happened to Nick Price, who was tied for the lead with David Frost. During the round, Price hit a drive into the fairway and his caddie moved an advertising board which was 25 yards ahead of Price's ball. The sign was classified as an immovable obstruction, so Price should have gotten a free drop. He didn't know that, and after his round when his scorecard was already signed, Price learned that he should have dropped instead of taking the sign down. That meant that Price had signed an incorrect scorecard. Even though local officials told Price that he could change the card, Price rejected the offer and left the scoring table, thus disqualifying himself from the tournament. Instead of a chance at either the $1 million winner's check or the runner-up check of $300,000, Price got $105,000.
I heard that the infraction was mentioned by David Frost after Price had signed his card.
Bob