I think I have had the following 5 holes in one (I have been playing over 60 years). Do you agree, especially regarding the last one listed?
One in a club open tournament, witnessed by my 3 fellow competitors.
One in a friendly fourball.
One while practicing on my own and witnessed by a green-keeper.
One while practicing on my own, no witnesses, I was playing 2 balls from each tee and the second one was holed. Clearly not an official one, but nevertheless definitely a hole in one.
Finally, in a competition on a par 3, I hit my first ball over the back of the green where there was a short downslope then 3 metres of thick rough and then out of bounds. Local golfers always played a provisional here if they went over the green. I did so and holed it. My first ball was easily found, so I continued with it and scored 4.
Regarding this last one, people always say it cannot be a hole in one because, being a provisional, it would have been a 3. I say it wasn't a 3 because my carded score on the hole was a 4. The provisional ball was a 'void' and sort of 'scoreless', but with one shot it was hit from in between the tees and into the hole. Surely a hole in one?