Aside from containing what may be my favorite ad-lib, the dialogue between Pyne and Zappa illustrates a fundamental theme of this book: often when we make a decision about someone or something, we don’t use all of the relevant available information. We use only a single, highly representative piece of the total. An isolated piece of information, even though it normally counsels correctly, can lead to clearly stupid mistakes—mistakes that, when exploited by clever others, leave us looking silly or worse.