Idiom for when someone relates two unrelated things

Is there an idiom about someone who surprisingly relates two unrelated things in an unbelievable story?

"Cock and bull story" seems to be used mainly about complex stories told as an excuse (e.g., see examples provided here), and after all, it doesn't necessarily contain two unrelated things which have been surprisingly related: What matters is that the story is implausible.

The answer may be an idiom in the form of "He relates X with Y!" (for example "He relates pants with pandas!").

strange bedfellows

bedfellow

—often used in the phrase strange bedfellows to describe an unlikely alliance of people or things m-w

Polities and good architecture are strange bedfellows, but in Barcelona the marriage has worked.

A pair of people, things, or groups connected in a certain situation or activity but extremely different in overall characteristics, opinions, ideologies, lifestyles, behaviors, etc.

A notorious playboy musician and an ultra-conservative media pundit may be strange bedfellows, but the two are coming together all this month to bring a spotlight to suicide awareness. Farlex Dictionary of Idioms

... including not only relatively well-known films like Mel Brook's Young Frankenstein (1974), but also some very strange bedfellows like Abbott and Costello Meet Frankenstein (1948), Jesse James Meets Frankenstein's Daughter (1966), and even Frankenstein's Great Aunt Tillie (1984). Garry Gillard; Empowering Readers: Ten Approaches to Narrative