Nature Pants provides examples of:
- An Aesop: You can't become something you're not just by acting like it. You are what you are and you should accept it.
- Ax-Crazy: Patrick, of all people, goes crazy when SpongeBob refuses to come home. He even threatens to put SpongeBob in a jar and keep him in there. Forever.
- Bad "Bad Acting": Patrick in the scene below.
- Barbie Doll Anatomy: On SpongeBob, after he goes and lives with the jellyfish.
- Brick Joke: The poison sea-urchins.
- Hulk Speak: Patrick devolves to doing this during his breakdown.
- Ironic Echo Cut: "Even Squidward misses you." Cut to Squidward throwing himself a "Goodbye, SpongeBob" party.
- My God, What Have I Done?: When SpongeBob realizes the error of abandoning his normal ways.
- Nature Lover: What drives SpongeBob to live with the jellyfish.
- Noodle Incident: "That's the fifth time this week I had to scrape you off of something."
- Offscreen Crash: Patrick causes this when he throws aside the pile of SpongeBob's old phone books.
- Ominous Music Box Tune: When Patrick declares that he's going to make SpongeBob a trophy.
- Painting the Fourth Wall: Squidward references the episode's running time:Sandy: I give him a week.
Squidward: I give him eleven minutes.
- Please Put Some Clothes On: Squidward, when he gives SpongeBob his pants back at the end of the episode.
- Reading the Stage Directions Out Loud: Patrick, in this scene:
- Scenery Censor: When SpongeBob takes off his pants, he's standing behind a bush.
- Yandere: Patrick, full stop. A rare platonic example.
Airdate: September 11, 1999Squidward tricks Spongebob into believing it is opposite day, so he can try and move away from SpongeBob. Needless to say, this eventually backfires.
Opposite Day provides examples of:
- All There in the Script: The credits list the realtor's name as Patty.
- Bad Impressionists: Patrick when imitating Squidward. He just goes "I'm Squidward, I'm Squidward" over and over in his normal voice.
- Big "NEVER!":Squidward: (clinging to the real estate agent's leg) Please sell my house!
Real Estate Agent: (yanks her leg out of his grip) NEVER!
- Butt-Monkey: Squidward, especially since he was trying really hard to sell his house in this episode.
- Chased Off into the Sunset: In the ending, Squidward chases SpongeBob and Patrick with a bulldozer that he used earlier to clean up the mess they made at SpongeBobs house.
- Getting Crap Past the Radar: In the German version, Squidward calls his neighbors "Barschgesichten" ("Perch faces"), a pun on "Arschgesichten" ("Ass faces").
- I Will Show You X: When Patrick and SpongeBob tell Squidward, "Happy Opposite Day, Squidward! We hate you!", Squidward gets ticked off before suddenly smiling and calmly saying, "Let me show you two how much I...HATE YOU!"
- I've Heard of That — What Is It?: The Trope Namer:Patrick: Opposite Day? Hey, I've heard of that!
Patrick: No, what is it?
- Not Their Birthday: The episode opens with SpongeBob and Patrick throwing Squidward a surprise birthday party. After they leave, Squidward yells at them that "It's not my birthday!"
- O.O.C. Is Serious Business: Played with. SpongeBob becomes very concerned about Squidward's being when he sees him suddenly acting silly and cheerfully, but Squidward was just acting in order to convince SpongeBob that it's Opposite Day.
- Opposite Day: Obviously.
- Rewind Gag: Part of their "oppositing" montage has Spongebob and Patrick briefly speaking backwards.note
- Screw This, I'm Outta Here!: The Real Estate Agent, who's fed up with Squidward, SpongeBob, Patrick and Gary (pretending to be Squidward).
- Title Drop: Naturally.
- Voice Changeling: In the German dub, SpongeBob, Patrick and Gary can mimic Squidward's voice perfectly.