Any part of the operation that has an outcome that you can’t examine. You’re handed a report that says the Russians have invented time travel. You ask where this came from. You’re told that the source is out of your reach but you are to treat the report as gospel. You’ve just been black boxed. Your door keeper tells you to keep a careful eye on Madagascar. You ask why. You’re told that you have no need to know. You’ve been black boxed. Later, when it turns out that the Russians don’t have time travel or that nothing is happening in Madagascar, you will be blamed for squandering resources. That’s called being screwed.