OUR local airport (NCL EGNT) won't let you through 'security' with a capped cardboard cone of Costa coffee (not available 'airside').
The reason for this, G-CPTN, was that a Daily Telegraph reporter smuggled a craft knife (sharp enough to cut someone's throat) through at Gatwick hidden in a capped cardboard cone of coffee - and it was Costa Coffee too! Sorry, but I side with the security guys on this issue!