To see how Logic really works, it is simplest to proceed by example. We'll present three example sets plus discussion. The first is drawn from computing, where ``logic'' is the bread and butter of existence and where the engineering requirements do their best to exclude or manage ``impossible'' cases. The second is drawn from propositional logic, which is the kind of logic that is ``closest'' to the logic of a computer program. Finally, we present an example drawn from predicate logic, the logic of human language and rhetoric, which is in many ways the most difficult to logically analyze. It is also a kind of logic that openly encourages logic puzzles, paradoxes, and Gödellian knots.