Anon has been lied to an inordinate amount of times this week by people he did not believe would ever try and cast an untruth in front of him. Knee-jerk reaction is to call it right out and shut it down, but after being part of this movie anon has found a couple of different methods to get those liars caught up in their own webs without seeming to be the one to do it.
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Utilize their scapegoat to the utmost. When liars tell you there's a reason for one thing, but there's actually a different reason, make that first cover seem steadfast and bolster it as many times as it comes up. This will require them to actually act like they are working to fix the scapegoat, when they never were, anyway. It wastes their time, frustrates the shit out of them that the web has been split into two and they have to work double-hard to make it seem that the lie was a truth.
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Head them off at the second branch. Usually, these untrained liars have only come up with the first part of a lie and haven't thought about what would come next. An astute anon will hear the lie, nod his head, and extrapolate the web to the second branch, mentioning something about that before they get to it. By the time they get to it, they have usually forgotten what anon said, until it slaps them right in the face.
So, let them lie. Then let them get caught up in their own web. They shouldn't have lied in the first place.