Universal affirmatives can only be partially converted; my wife, however, does not understand this necessary limitation of the conversion of a proposition; consequently, she does not understand me, for how can a woman expect to appreciate a professor of logic, if the simplest cloth-eared syllogism causes her to flounder?
For example, given the premise, "all fish live underwater" and "all mackerel are fish", my wife will conclude, not that "all mackerel live underwater", but that "if she buys kippers it will not rain", or that "trout live in trees", or even that I "do not love [her] any more." This she calls "using her intuition". I call it "crap", and it gets me very irritated because it is not logical