The 'Aha Moment!'

Interesting article by Michael Knost over at the Cemetery Dance website, concerning the 'Aha Moment' every writer (hopefully) gets when they get to mark one in the win column.
Of course, I have my own variation on it, called the 'D'oh Moment', when I submit the absolute wrong thing to the wrong market at the wrong time. I get the latter much more than the former, unfortunately.
Feel free to share one of your own (of either) in the comments.