Originally Posted by
goalie
And you never will

as the TSA will use "SSI" as a catch all for what they don't want to tell you/what they don't want you to know-even if the information has absolutely no impact on or is absolutely no threat to nash'nul skewrity whatsoever
Bolding mine: Yup ^ and I can't wait for a pax to be arrested for interfering with the screening process because they gave a middle digit salute while in the NoS.

Actually, the one time I went thru a scan (MMW), I did exactly that! The trick is to not curl up all your other fingers into a fist, but just loosely curl them a little, and separate them from the relevant digit. So your fingers are still open and separated, one of them is just a little more prominent than the others.