I suspect that, if security staff were more intelligent, life would be even more difficult for the passengers. One of the minipulses has a holiday job working as a search officer at a ferry terminal. After only three weeks of hearing the same "original" jokes from punters he has started to look for ways of relieving the boredom.
Last week he won a £30 bet by getting a car driver to stand on one leg and recite "I'm a Little Teapot". One wonders how many of the other incidents are for similar reasons.