Re: Empty bottles are highly dangerous...
Surely you aren't allowed to take a young child on a plane?
Remember those safety-ads for car seats? The ones saying an un-restrained child had the energy of 100 charging bull elephants or some such rubbish. A small child could be hurled down the aisle of a plane as a weapon.
Of course a balastic small child could also be thrown to incapacitate a hijacker, which is why sky marshals are now present on many flights armed with a baby. When you next see a women with a crew cut, a mustache and badge breast feeding a child at an airport you will now why.