I think you’re missing the specificity of this trope. It’s not just dating people who you’ve met through others. It’s when your ex dates your current parter’s ex.

Of course that does indeed happen in real life, but I’d say it’s odd enough to be remarked on. [Edit: maybe especially among straight couples?]

In fiction, it’s common enough to arguably be cliché.

> The result means that transgender individuals can legally change their gender by self-declaration alone, without having to undergo a lengthy medical process — including a psychiatric assessment — as under the previous law.

>The changes will also see the abolition of a requirement that transgender people must be unable to reproduce.

>Under Finland's previous law, transgender people were required to provide a medical certificate proving they are sterile, in order to legally confirm their true gender.

It’s worth pointing out that the Brothers Grimm were more researchers than creative writers. The folk tales they wrote down were popular tales of the day, collected and recorded by the brothers.

Gosford Park - an excellent example of the classic murder mystery set in a posh English family home

Charade - a bit more playful and comedic, with lovely 1960s style

Brick - stylized neo-noir set among high schoolers

Zero Effect - blackmail rather than murder mystery, but follows a fun detective inspired by Sherlock Holmes

• Rosencrantz and Guildenstern Are Dead (1990)
• Dead Man (1995)

I’d say that both of these movie adaptations dropped a lot of the interesting philosophical aspects from the books.

If you want to engage with the more philosophical themes, you might want to both read and watch them.