Only been playing 1 year. Nearest i've come was at The Glen (can't remember what hole) nice 7 iron to a blind par 3, got up there to see it about 12" from the hole. Never seen one on the course either.
I had a very lucky one when I was 12 years old. Ball rolled back into the hole off a steep bank at the back of the hole. Since I started playing again 2 1/2 years ago I haven't even been close. About 4 feet away is probably my closest. Though I did hole a 100 yard shot on a par 5 last year, unfortunately it was for a par.