Question: Unlike the episode "Today I Am a Clown", which has a religious theme, "The Simpsons"' episode "Alone Again, Natura-Diddily" demonstrates what theme?
Sentence (from "List of Great Teacher Onizuka episodes"): The second opening theme, "Hitori no Yoru" by Porno Graffitti is used from episodes 18 to 43.
Relevant evidence: No