These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Crowning Music of Awesome: "It's a Privilege to Pee"; the Act One finale, "Run, Freedom, Run!" Indeed, more of its songs could arguably qualify as the crowner than not.
Moral Event Horizon: Caldwell B. Cladwell crosses this when he sends Bobby to Urinetown, which is actually execution by being thrown off Cladwell Column, knowing full well that the rebels would kill his daughter. Necessarily Evil or not, that was just unpardonable.