I don't have a "favorite" but I once heard a consipracy theorist discuss a supposed CIA term called "slides" which is explained below. Regardless of where the term might come from or who wrote the passage below, I think the concept exists (just look to modern-day political discussion).

An excerpt from the first Google result regarding the term:

Most people have built in "slides" that short circuit the mind’s critical examination process when it comes to certain sensitive topics. "Slides" is a CIA term for a conditioned type of response which dead-ends a person’s thinking, and terminates debate or examination of the topic. For example, the mention of the word "conspiracy" usually solicits a slide response with many people. -Fritz Springmeier, author of The Top 13 Illuminati Bloodlines and de-programmer