A Cupcake. Well, they you, my friend, are not qualified to be a TSA Screener. TSA, of course, stands for Transportation Security Agency - created in 2001 to "Safeguard the United States Transportation Systems".
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And the TSA, ever vigilante - ever on guard so you don't have to be, spots over 3 oz. of gel - masquerading as chocolaty gooey goodness... And therefore, a potential explosive device. And so, the cupcake of death was confiscated, the plane was safe and we can all breath a little easier tonight. (honest)