Add a targeting computer on the catapult and it might be pretty effective!
Used microwaves are almost certainly cheaper than any similar munitions used by the us mil.
But if someone microwaved fish in one it might be a violation of international law.
Know this is supposed to be a joke but why
Microwaving a trout actually works pretty well, but the joke is that it releases enough odor that just might be strong enough to be banned under The Hague Convention Against Chemical Weapons.
It’s definitely not a nice thing to do to the office microwave!