Ok, this may seem ridicolous but what if you hit a shot and while it's in the air a bird nabs it and drops it in the hole? Can this be done if you stick a friend up a tree and aim up at the tree, getting him to catch it and put it in the hole?

Curiosity again, although, I'd never try and cheat to improve my score.

Gonna keep trying 'til I find a loop hole and can therefore achieve 18 holes in one !