I have seen 3: Marked 2 on the card, same player same hole back to back medals. Was a blind pin position on both occasions so didn't see them actually go in. The only 1 I have seen go in was on a downhill par 3, was a really foggy day so as you left the green you shouted to the group behind to tee off & watched for where they went. First player found the green, second we never saw, third landed 10yards short of where we stood on the next tee, cannoned 90degrees off a rock, bounced on the green and rolled straight into the hole!
Ha ha so many hole in ones are not pure shots like we see on TV, just luck of a bounce!