Electricity. And explosions. And lots of big flying objects via some miraculous onset of psychokinesis.
And when I clap my hands while standing in the center of New York City, every single glass window shatters into a billion pieces, and the buildings suddenly crack and begin to crumble to the ground in ruins. Nobody gets physically hurt, but they do get to see their entire society collapse before their eyes.
At least, that's what happened in my dream. In real life, all I'd need is the ability to will a curse of extremely bad karma upon anyone who tries to harm me or anyone else, which lasts forever or until they finally change their ways for good, all while I stand in the background and laugh at everyone.