Anything that can go wrong will go wrong. Except when you want to prove this. If there is a possibility of several things going wrong, the one that will cause the most damage will be the one to go wrong. If there is a worse time for something to go wrong, it will happen then. If at first you don't succeed, destroy all evidence that you tried.
Success always occurs in private, and failure in full view.
The tough part of a Data Manger's job is that users don't really know what they want, but they know for certain what they don't want. No one is listening until you make a mistake. One child is not enough, but two children is too many. The bag that breaks is the one with the eggs. The more an item costs, the farther you have to send it for repairs.