Mutually assured destruction

Milo, showing me his latest Tinkertoy invention: “Look, Mom! This wrecker destroyer has SIX zappers on it. So if Morris tries to destroy you again, I can protect you.”

Morris, who had been sitting quietly in my lap, turns and points a Tinkertoy lollipop at my face: “Zap! Zap! Zap! Zap! Zap!”