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Invoked: Bob has gone to some lengths to make one chair obviously the most inviting, and uses it as a Secret Test of Character; in his opinion, people who would go straight for the best seat in somebody else's home are selfish and untrustworthy.
Charlie tricks Alice into sitting in Bob's favorite couch in order to start a fight between them.
A prankster doesn't want to embarrass anyone but Bob, so he puts the whoopee cushion where nobody else will sit.
Defied: Alice insists that no chair is any more "his" than the living room itself, seeing as they share the house equally.
Discussed: "Bob usually sits there. Is he going to go mental if he catches me there?"
Deconstructed: Alice's resentment gradually builds over Bob telling her where she can go in her own house. Bob himself is showing increasingly distressing signs of obsessive-compulsive disorder, but in her anger all Alice can see is that he's being a dick.
Reconstructed: Alice knows Bob has OCD tendencies, and knows he doesn't mean to be demanding, so she accommodates him. She lets him know when his quirks cross the line into being unfair on others, though.
Implied: If anyone is sitting in Bob's usual seat when he enters the room, they get up and let him have it. Nobody ever says anything about this.
Played For Drama: Alice sits on the cushion as a show of defiance... and rips it. Cue Broken Treasure plot.
Played For Laughs: The chair becomes the focal point of a This Is My Side dispute, and the room-mates' attempts to seize and hold it play out like a trench battle over a strategic landmark.