"In war you will generally find that the enemy has at any time three courses of action open to him. Of those three, he will invariably choose the fourth." —Helmuth Von Moltke
(quoted in "Capturing the Potential of Outlier Ideas in the Intelligence Community", via Bruce Schneier)
There is a corollary of the Law of Fives in Discordianism, as follows: Whenever you think that there are only two possibilities (X, or else Y), there are in fact at least five: X; Y; X and Y; neither X nor Y; and J, something you hadn't thought of before.
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