"sexual self-gratification" works always better than Halloween costume with highly trained officials. I tried both but with the first answer I never got any more questions. Strange looks perhaps, but they never dared to ask. And that answer works for anything, from a steel cable to 5 left shoes or a map carrier roll with a handembroidered wall hanging. It even worked with a half-finished shirt of chain mail.
Oh there are some funny people on here ;D