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A loud, stupid promise made by kids in school who think they're the next big thing. It's like saying you're going to take over the world with a tiny toy gun.
"I have a gun!" said the kid who brought a plastic sword to the principal's office.
"I have a gun!" yelled the kid who forgot to bring anything to the fight.
"I have a gun!" screamed the kid who just got caught eating pizza in class.