"[to Jojo] What will you do, sweet Hitlerchen? Hmm? Of course. Go on, then. Tell them. But do you know what happens if you do? I'll tell them you helped me. And your mother, too. Then we'll all be kaputt. And if you tell her you know about me, just one word... I'll do the world a great, big favor and cut your Nazi head off. Got it?"
January 1, 1970
https://en.wikiquote.org/wiki/Jojo_Rabbit