Maggie Gyllenhaal still has people approach her to ask about Taylor Swift's scarf.

Don't know what we're on about? Neither does Maggie. But, let us explain.

Cast your minds back to the winter of 2010, when the internet was awash with pictures of Jake Gyllenhaal, Taylor Swift and Maggie Gyllenhaal strolling in the brisk New York air, all swaddled up in coats, puffer jackets and…a scarf. Dun dun dunnnn.

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Swift and Jake Gyllenhaal (Maggie's brother) dated from October 2010 to January 2011.

Obviously, this wouldn't be a Swift relationship if we hadn't get a song out of it, and the hit 'All Too Well' is said to be about the older actor (Swift was 21 at the time, and he was 30).

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One of the first lines in the song goes, 'Left my scarf there at your sister's house / And you still got it in your drawer even now.'

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According to the track, Jake keeps the scarf because it, 'reminds [him] of innocence and smells like [Swift].'

Now, seven years later, Jake's sister Maggie, is still getting questions about the scarf from the song.

On Tuesday night, she was on the talk show Watch What Happens Live with Andy Cohen (alongside 50 Cent) when she finally said , 'You know, I never understood why everybody asked me about this scarf. What is this?'

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Even after Cohen read the lyrics to her she responded, 'I am in the dark about the scarf. It's totally possible. I don't know, but I have been asked this before and I've been like, "What are you talking about?" '

Another mystery gone unsolved.