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nman
Since: Mar, 2010

This may touch on several tropes, but it's mainly a form of Exposition. The trope I'm looking for is when the Hero is looking for answers, and after going through a lot of trouble, he finds someone who knows what he wants to find out: the Truth.
The exposition which follows is usually something the Hero isn't supposed to know; it's secret, it's dangerous, and it's completely at odds with the 'official' story that everyone else accepts as the truth. Usually begins with "I shouldn't be telling you this."
X-Files was fond of this trope, but it's been so long ago I don't remember concrete examples. Babylon 5 used it in season three when the informant told the Command Staff about the Shadow vessel she'd seen on Mars, ending with, "Okay, now you know. They can kill me if they want." Played with in the Serenity movie when the Crew finds out the truth about the Reavers from a dead woman in a hologram. It's typical for the informer to die after imparting this knowledge to the Hero, actually — leaving them as the sole living possessor of the Truth.
Is there a name for this type of exposition scene, or should I start a new YKTTW? Do I need more examples first?