Any instance where at least one other character is hanging around a couple and some form of social tick is getting in the way. He/she can either be
A) a nuisance to the couple and they consistently tell him/her to leave them alone,
B) a character who doesn't want to spend time with the couple but they drag him/her along, or
C) a character who is pulled into being with a couple due to circumstance and no parties necessarily have ill will toward each other, but awkwardness may ensue anyway.
Usually does not translate into a relationship between a couple and a third party who genuinely like to spend time together in a friendly way, since that would imply little to no awkwardness.
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Anime and Manga
- In The Adventures of Milo and Otis, main characters Milo the cat and Otis the dog spend most of the film trying to reunite, but when Milo falls in love with another cat, Otis becomes this for a little while. Otis is mostly a case of type C.
- Both Sherlock Holmes films are ripe with this trope. Holmes is a third wheel to Watson and Mary, or if Mary is a third wheel to Holmes and Watson; Heterosexual Life Partners or Ho Yay, your choice.
- Harry Potter - When considering the idea of his two best friends getting together, one of Harry's concerns is that it'll be impossible for the three of them to hang out like they used to. Luckily, they spend too much time snarking at each other to turn into Sickeningly Sweethearts.
- Mansfield Park - Type C: Henry Crawford visits Fanny Price in Portsmouth and tries to get her on her own, but finds Fanny's 15-year-old sister Susan a hindrance.
Live Action TV
- A Mr Show sketch is about this: a couple's friend joins them on their honeymoon. The wife is type A but the husband is type C. Said third wheel breaks into a song about this every time the words "third wheel" is said.
- Timon and Pumbaa of The Lion King certainly become third wheels once Simba and Nala meet up again. It definitely is mostly type C, but Simba kind of politely lets Timon know that the two of them aren't wanted, making it somewhat type A.
- In "Dan Vs. The Fancy Restaurant" Dan accompanies Chris and Elise on their anniversary dinner.
Dan: Why is having a third wheel a bad thing? Third wheels provide stability, that's just physics.
- In the Futurama episode, "Put Your Head on my Shoulders" Fry starts to worry that his relationship with Amy is going too fast, so he intentionally invites a third wheel on their date.
Amy: So, ready for a secluded picnic with just you and me?
Fry: Hey, you know who loves secluded picnics with just you and me? (looks over at Leela who shakes her head.) Uh, Dr. Zoidberg.
Zoidberg: Did someone say something about a free hot meal?