Cannon

Look, Confucius said, among many other things, not to use a cannon to kill a mosquito. Supposedly, certainly people say he said that, which is as close as you get with most things.

And sure, that’s generally good advice. Overkill is a bad thing, especially when it’s not needed. And when you factor in collateral damage, the cost of acquiring the cannon, the shells, the training… Yeah, just use a flyswatter. Much easier and appropriate for tiny insects.

But unless you have a flyswatter the size of a battleship, I’ll stick to my ion cannon for these flying aliens, thanks.