Phineas and Ferb/Nightmare Fuel


 * Take the "Smile Away" reformatory from "Phineas and Ferb Get Busted" for instance. Combine Adult Fear with Crap Saccharine World, give it a nice dash of the Pavlovian Treatment from A Clockwork Orange (Yes, they actually made it look exactly like that), and have it be run by a Complete Monster that is a Knight of Cerebus, and that's the basic idea of the place. Oh, and this is all centering on two completely lovable little boys. And it's accidentally their sister's fault they're there.
 * Thankfully, that was All Just a Dream within a dream.