Don't say anything these days except "Yes, Sir (or Ma'am)" and "No, Sir (or Ma'am)" as the case may be. Even saying something as innocuous as "Oh, my! I totally forgot I had that submachinegun and those hand grenades in my baggage!" can land you in trouble. Why, you can't even have a flare gun and flares in your checked baggage! You can bring a guitar into the passage space but not a sword, not even a fencing foil! I tell you, I don't know what the world is coming to!