I thought it would be both interesting and useful in this fourth installment in the continuing Three Ring Circus saga to explore in some depth four subjects that have never been totally clear to me. I do so in the hope that, in addition to improving my understanding, this effort will be helpful to others who also find these subjects somewhat of a puzzle. Therefore, this Article will evaluate the origins of the balancing of interests test, revisit the Commerce Clause in its dormant state and the balancing of competing interests, reexamine the intermediate scrutiny of gender-based classifications, and return to the idea of similiarity of situation.