synchronicity? or just really timey-wimey?

I've had SJ Tucker's song The Truth About Ninjas stuck in my head lately (it's one hell of an earworm) and wound up ( filking it. )

Now, I SWEAR I wrote that Friday, just trying for a funny twist and contrast on the original. Today, entirely by chance, I read a fic that I would love to be able to claim retroactively inspired it. Cause and effect... that order's just a suggestion, right?