“Against the fashionable (and idiotic) claim that revenge is just hardwired and an instinctual response programmed into our genes and neuro-structures,” argues law professor William Ian Miller in an analysis of Njál’s Saga, “actual Icelandic feuding” rather “made it preferable for revenge to be served up cold; take your time and think. Only the stupid hit back right away.”

Carl Jung attributed his split with his mentor Sigmund Freud around 1910 in part to a generational divide. “Our descendants are our most dangerous enemies,” Jung argued, “for they will outlive us, and, therefore, without fail, will take the power from our enfeebled hands.”

In the Texas border town of Lajitas, generations of goats named Clay Henry have since 1986 served as mayor from a pen outside the general store, where passersby often stop to give them beer. In 2001 a local man became envious that Clay Henry III was allowed to drink alcohol on Sunday in the blue law–abiding county. “The next morning,” the local sheriff reported, “the goat was found lying with its testicles cut off.”

In 1873, as part of the Bone Wars, paleontologist Othniel Charles Marsh complained in The American Naturalist that his rival, Edward Drinker Cope, was dentally inept; he “mistook canines for incisors, nasals for frontals, maxillaries for premaxillaries, maxillaries for nasals, and maxillaries for frontals!” Cope claimed he was “too fully occupied on more important subjects.”