I never open the seatbelt when flying.

Even when the sign comes off.. I open it when I get up to the bathroom or so of course, but besides this.. I truly believe that when that several hundred ton heavy plane hits the ground at 800 kms per hour..that seatbelt might safe me, LOL.

Never being in FC or in a RCC counts for me too...
Never been really in Chicago, Denver or NYC but changed planes there a couple of times and spend hours and hours at these airports.
I also didnt apply to Deltas program despite flying MUC-DEN with them once (hey, still makes 10k miles!)
and most of all I did not get the Muc-den flight the year afterwards credited to my already existing Lufthansa M&M account!