Sometimes we hear the words to a song and think, "Wow, that Morrissey sure can write," only to find out that Taylor Swift actually penned the tune. It seems that the former Smiths singer and the recent Grammy winner rely on similar lyrical inspiration from time to time.

Today's lyrics -- the one sandwiched above between the two artists -- is certainly one of those times when we have to take a few seconds to think about who wrote them. It's been well-documented that Morrissey has had plenty of perfect days ruined over the years (and he's also been known tor ruin some himself). Then again, Swift has had so much boyfriend trouble over the years, she probably doesn't go a week without having a perfect day ruined.

So, do you know who wrote those lyrics? Take a guess, and then click the button below to find out if you're right.

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