This document summarizes a talk given by Dr. David Dixon on "Pathological Physics" about crank theories from non-mainstream scientists. It discusses why these theories are described as "pathological" using examples from the Dunning-Kruger effect. It identifies three primary types of cranks: those who are crazy, naive, or stubborn. Examples are given of each type including an American Life radio segment about a man promoting incorrect theories. The document cautions that crank theories cannot be reasoned with but discussing them can help immunize students against bad ideas and show conceptual dead-ends.