Here is an intricate cupcake bylaw from airport luggage overlords TSA: while pies and cakes are generally allowed in carry-on luggage, cupcakes in jars are not. Cupcakes in jars are also a thing now? Anyway, it has to do with the amount of icing involved, which, when jarred, seems to qualify as a potentially explosive gel. Despite outcry among the cupcake-loving masses,the TSA stands by this call saying jarred cupcakes are not "run of the mill" cupcakes. [TSA Blog]
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