Ship Sinking/Playing With

Basic Trope: The creators of a series deliberately torpedo a certain couple and make it clear the pairing won't happen in Canon.
 * Straight: Alice, Bob and Charlie are part of a Power Trio. One day, an episode rolls around where Belligerent Sexual Tension finally leads Charlie into kissing Alice, only for Alice to stop him, telling Charlie that to her, they are Like Brother and Sister and they will never become a couple.
 * Exaggerated: Instead of just a Like Brother and Sister, they find out they are actually brother and sister.
 * Alice and Charlie have a massive dispute that creates irreconcilable differences between them, while on a literal sinking ship. That Bob owned. And Alice is responsible for it sinking. Which Bob won't forgive her for.
 * Alice is Bob. And so is Charlie. Cue subtitles saying "Problem, Shippers?"
 * Justified: They had always intended for Alice and Bob to get together, but over the course of the episodes they realised they'd created a Relationship Writing Fumble for Alice/Charlie and needed to correct it.
 * Inverted: Official Couple
 * Subverted: Yep. They really are brother and sister. Here, have some canon Brother-Sister Incest.
 * Double Subverted: Turns out they aren't brother and sister at all, but discover Alice's mother killed Charlie's father, and neither can stand to be around the other any longer.
 * Parodied: They spend an entire episode sinking every ship on the show, even completely non plausible ones.
 * Deconstructed: Alice ends up alone and miserable, wishing she'd taken the chance to be with Charlie.
 * Zig Zagged: The ship keeps getting sunk and refloated every so often, completely infuriating both the Alice/Charlie shippers and the Alice/Bob shippers. Or it's part of the Star Wars extended universe, and you've got writers fighting over the ship using actual canon.
 * Averted: They become an Official Couple. Or the relationship takes a natural backseat to the Alice/Bob and Charlie/Donna relationships. They simply don't ever end up in a situation where one or the other has to stop a potential relationship, or has to tell the other they don't want the other for a relationship.
 * Enforced: The actor who plays Charlie is leaving the show. They decide to sink the Alice/Charlie ship so they can move on to the Alice/Bob relationship in the future, with no baggage.
 * Lampshaded: "Wow, that feels great. Now I can go after Bob without feeling like I've lead you on."
 * Invoked: Charlie forces Alice to confess or explain her feelings, and those feelings are platonic.
 * Defied: Charlie refuses to give up up Alice.
 * Discussed: "Look, Alice, I think Charlie might have some feelings for you. You should think about telling him you're not interested."
 * Conversed: "There goes Charlie and Alice. Poor guy. Sucks to be in love with someone not interested."
 * Played For Laughs: Bob acts as a Shipper On Deck for Alice/Charlie, and all her attempts to get the pair together end up highlighting all the reasons why the relationship doesn't work, and why Alice/Bob would.
 * Played For Drama: Charlie has had a crush on Alice for a while now, whilst Alice has been content not to hurt their friendship. Charlie overhears a conversation that leads him to believe that Alice might like him finally, he makes a move for her... and is brutally shot down, as well as finding out that Alice loves Bob instead. This leads to severe jealously and anger for Charlie towards Bob. It also threatens the foundation of the Alice/Charlie friendship, perhaps to a point where Charlie thinks about leaving.

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