Stupid girl!! The last thing anyone should say around an airport these days is the "B" word, or gun, or SAM or any such similar utterance. A country that confiscates crew tools, eg Leatherman, is bound to bang up someone who says they have a bomb.
What students consider funny, or even the great travelling masses, does not go down well in airport environments, it never did and it never will. The sooner people realise that the better it will be for everyone especially those charged with our security. What was the policeman supposed to do? Say "Yeah, right. On your way love". Headlines next day, bomb blast devastates XXXX airport, policeman arrested for failing to act when suspect said she had a bomb.