I have flown many times to Taiwan, and believe me, last thing I wanna hear is someone talking about 911 or terrorists. I already have a fear of flying, and that kinda talk is not acceptable period. On the other hand, I have had that discussion about the safest seat on a plane with my wife many times. Nothing wrong with that, but if that discussion includes bombs, terrorists and other none cool things to talk about on a plane then it should not be spoken.