Too Soon?

Son 1: "You're worse than 12 Hitlers."
Son 2: "You're worse than Mecha-Hilter."
Son 1: "You're worse than a Hitler made of wads."
Me: "Boys, in this house, we obey Godwin's Law*!"

* Godwin's Law of Nazi Analogies: Once a comparison is made, the conversation is finished and whoever mentioned the Nazis has automatically lost whatever debate was in progress.
(Ref: http://en.wikipedia.org/wiki/Godwin's_law)