Reminds me of the time about 1980 that I had a meeting with Jack Tuthill of the PGA Tour at a hotel near the Western Open. Got there early, thought I would have some breakfast, and shortened the wait time by being paired with another single, an older gentleman.
We start talking golf and golf architecture and at one point he tells me he was in a pro am at Turnberry (Scotland) with Don January, who marked his ball one putter head length left of his real position, but replaced it on the mark without moving it back. He putted out, but realizing his mistake before leaving the green, was charged with a one stroke penalty.
So, this guy goes on to say he was a terrible putter, so on the next hole- the famous lighthouse hole - he is 90 ft away from the cup, but marks it on the lip, putts from there for a three, declares his mistake before leaving the green, and takes 4, when it would likely be a 5.
As I am beginning to wonder about all of this, Tuthill sits down and says "Hi Sam, what are you doing here, you old goat?" Turns out, I was eating with Sam Snead and they discussed how they changed the marking rules (I think adding the rule 1 about "the spirit of the game" based on that incident.