Underestimation: the art of miscalculating the severity of a situation, often resulting in catastrophic consequences.
Example 1: "I'm sure it's fine, we'll just wing it, no problem!"
Example 2: "That's a great idea, let's just add a few more zeros to the end of the budget, it'll be fine."
Example 3: "I've never seen this happen before, so it's definitely never happened before."
Want to learn more about the dark arts of Wrongness?