God help us when they figure out that urine is an ingredient of gunpowder.

During the busiest travel season of the year, travelers carrying thermoses or beverage cups – which could be used to conceal explosive materials – may be subject to extra scrutiny.—Christian Science Monitor

Plus, they’re unbreakable. They must be dangerous.

Dear TSA: liquid explosives have been debunked. Plastic explosives can be carried in many containers, including stomachs and recta. Dayenu already.