I think it was Josh Lewsey who told the story of the Australian metal detector.
Leaving from Sydney airport after the world cup, the alarm sounded at the departure gate. Takes out all keys and money...sounds again. Removes all possible metal objects... sounds again. Big Aussie security guard says "sorry mate I'm gonna have to frisk ya"
"That won't be necessary" says Josh, taking out and displaying the winners medal from under his shirt!