Sayonara, Zetsubou-sensei/Fridge

Fridge Horror

 * Sayonara, Zetsubou-sensei is pretty blatant and tries to cross the line twice, but when Maria (the very young and naive but wonderfully Polyannaish immigrant) sees someone about to molest a child, she believes that he's just being a nice guy to children. Refuge in Audacity, right? And then you realize why everybody wants to protect her.
 * With the revelation in the manga that, this puts up the disturbing thought that

Fridge Brilliance

 * After the revelation in the manga that, a lot of the nonsensical symbolism in the show (particularly the opening and ending sequences) now suddenly makes sense as Foreshadowing when you realize that a lot of it can be interpreted as metaphors for It also explains how she is seemingly everywhere all the time.