Had my water confiscated at Newquay today. They were not impressed when I asked if they thought I was going to pour it on the main spar and wait for it to corrode through so the wings fell off. Some people have no sense of humour.
They did leave my toothpaste alone and did not seem at all perturbed about the 14" spike I use to anchor my kite flying lines to the ground that was in my bag.