Ammonia is another wonder substance. A lot can be done with iodine xyls and potassium permanganate crystals are interesting. So many. We loved explosions (and yes, one of our group now has a useless hand and little vision in one eye). I was lucky, a small dose of chlorine gas troubled me for a spell (still responsible for some problems?), but no damage from explosions. Chlorine- in so many cleaners, and not dificult to release.

Since most flights no longer serve meals(?), the lockers in the galley are mostly empty. This is where the liquor is put when not in use, so there are cabinets with locks, as Genie suggests. Overhead bins are for laptops, bowling balls and other weighty projectiles. But if a weak seal is used between two substances, and the seal deteriorates after a period- boom! Or the jar of air turbulance or landing- boom! - the possibilities are endless.

As to why the sudden kerfuffle about liquids, most of us, including officialdom, don't think of the possibilities, or dismiss them as unlikely, until something happens. All of a sudden, the light dawns, as it seems to have done.