Herr Doktor, the shipment of isotopes you ordered is here.
Excellent, my boy! Bring it to me! Careful! It’s very unstable!
It is?
Oh yes. Fissionable in fact! Very dangerous! Check out my old high school if you don't believe me! I can't go back there again!
Yes, Doktor, but what’s it for?
Now let’s see. . . I mix one part nuclear fuel with one part isotope; a pinch of enriched uranium. Stir in some rare earths. . . Excuse me, boy. What did you say?
What are you making?
Well, it's not a salami sandwich, I can tell you. Unless a salami sandwich can destroy the world!
That would depend on the mustard, wouldn’t it, Doktor?
What? Yes! Ha ha! Of course! (Note to self: consider the molecular structure of mustard in support of my hypothesis. Science!)