In The Elements of International Strategy: a primer for the nuclear age, there is a diagram on page 27. It shows two dogs, labelled A and B, in a stand-off over a bone. The caption reads: "Call A 'NATO'; call B 'Warsaw Pact'; call the bone 'Berlin'." This diagram claims to be a serious depiction of deterrence theory.

Well, yes. Of course, if dog A gets too belligerent and dog B decides to take a little nip at it, the world doesn't cease to exist.

But you can't ask for too much in a diagram, I suppose.