Universal power-nullifying device

"Doctor, you finally did it!""Yes, 'universal power-nullifying device' is complete at last.""Amazing!""Every weapon on earth will be neutralized—""peace will finally come!""Yeah. I'm really glad.""Let's turn it on right away, then!""Ah, wait a second—""We need to run the initial setup first—""Sorry, I already pressed the switch.""Let me switch it back off.""...huh? It won't switch back.""This device... also nullifies your power to press the switch."