An old man

Did an 18 holes in one in miniature golf. Edit: it is called putt-putt and it is designed to help you get hole in one. 3 in history.

My best miniature golf is three hole in one's in a row including one being a volcano one and my aunt is my witness. I did this at about somewhere between 8 and 12 years old, so 20 years ago possibly or more.