Actually, Jack Stall is a character, played by Ashton Holmes, in the 2005 movie “A History of Violence”. So, can we drop the colloquialism and refer to the phenomenon as “Servo-transparency?” Furthermore, servo-transparency is discussed under the normal operating procedures section of the POH, and described as “smooth” and “presents no danger.” I draw your attention to the tagline of the aforementioned movie, “Everyone has something to hide.”