I had a ball plug where in landed on a wet green with about 25% of the ball overhanging the edge of the cup. It was in a formal tournament. A rules official was called out. Lift and clean the ball, repair ball mark, and replace was the ruling. No hole in one.
Embraer- I'm with you on the double eagle. Holed a four-iron from about 210 in college. Had a second one two years ago by holing a two-iron from 248 (in cart GPS verification). Didn't even see it. The green was over a rise. Walked all around the green looking for my ball and eventually one of my partners looked down and saw it in the hole! I was happy to buy a round since the cart girl was particularly attractive that day
Gotta love a 2 on a par 5......