I suspect there are numerous cases where the original concept sucked, or even totally sank, but one gem survived from it, all the same. A popular area for this is movies, where the movie might have crashed, or been truly awful, but within that, that one shining beacon shone through.
Two movies I could easily have nominated for this are Absolute Beginners, and Give My Regards To Broad Street, but given both were generally designed as a window for a pop atar, and the awful record they have anyway, lets ignore those for now. Instead, lets take a movie that was meant to be taken seriously, but couldnt be if it tried, Mannequin.
The storyline was corny, and extremely saccharin, guy falls for mannequin, she comes to life, and general mayhem ensues. And yes, at the end, they get married, and probably go on to live happily ever after. I know how bad it is, I once saw the movie, and believe me, I know!
But for all that, there is one delight for me in this movie, the big song from it, by Starship. I know it, its the only reason I hunted down the movie to watch it in the first place, and wish I hadnt bothered! But the song, even today, still love it, though I never want to see the movie again.
Hope you enjoy it as much as I do.
PS Feel free to suggest your own fine examples of moments like this, it would be nice to hear from a lurker, just for once!