In the course of building the Lunar Module, a Grumman engineer made a calculation error that caused the junction of the lander legs and footpads to be made too fragile. In tests, the gear collapsed. The engineer stayed up late one night rechecking his work, and discovered the calculation.

In the modern world he'd have immediately attempted to cover his ass. In that world, he reported the problem immediately to his boss, project manager Tom Kelly, and took full responsibility for the costly setback in the project schedule (weight was critical, so any major redesign propagated through the entire project).

Kelly said to him - this is bad. But what you did with the information is good. Get back to work.

Mistakes are fate. Fessing up is free will.