Unknown liquids in any quantity > 3.4oz individually, about 1 quart in total.

Now there are binary liquids which when simply combined create an explosive mixture. They are used in minesweeping, target shooting and movie FX but require a detonator of some kind - not just shake-and-boom. Hopefully the purveyors are very carful about their customers, not something to be relied upon absolutely though.

Setting one (or more) off in an airplane cabin would not be pleasant to say the least; to do any structural damage would require literally gallons of the stuff. We're not talking Coke bottles or sippy cups here.