Am I seeing double, or is it just me?

On several occasions I have wondered how unique or generic my literary ideas were, and today it is time for it again. A couple of weeks ago I finished reading a book which sported several scenes resembling those descript in a story of mine (all in the same chapter, actually). To make this absolutely clear right from the start: I do not believe that the author has read my story and taken notes. And even if, it would not be plagiarism in any way, nor would I be pissed off – quite to the contrary. I would be intrigued by the rather absurd idea that somebody drew inspiration from my writing. However, since this is in all likeliness not the case, I am left in awe of the uncanny resemblance of scenes written separately by two different authors.