In the middle 80's, one of my Chicago friends told me about Arnold Palmer's great putting instructor, George Low. He taught out at St. Andrews in the summer in a Chicago suburb and charged $1000 for a series of 3 lessons. So I pony up the money and go see him. He reeked of booze, but... So he has me hitting 2 footers for the first 20 minutes. After sinking about 30 in a row, I lose concentration and leave one short.
He slaps me accross the face, gets about 2 inches from me, and is spitting on me as he yells at the top of his lungs, "What the fuck was that?"
It took me by complete surprise, but I can't remember ever not concentrating on a 2 footer again.
When I have time, I'll tell some other George Low stories, he was a hustler, mooch, freeloader and by the way, for 25 years I used his "open to square" putting stroke and anytime I went bad, I went back to my notes and after an hour or so, got it back. It worked until about the age of 52 when I got a little yippy with the short stuff. When I went to my notes, I got it back, but not reliable on the course, so I switched to left hand low I saw on TV on day and stayed with that. Eventually, I switched to an oversized grip, stayed left hand low and mastered that as well.
I stayed with that until I gave up golf about 3 years ago due to back surgeries.