That spoiler completely ruined the movie for me, because I went into it expecting there to be some kind of suspense or twist about Rosebud being the sled! And then Rosebud showed up, like, ten minutes into the movie, and I was like "okay, what's the point of this, then?"

(It turns out the point is Kane and Leland's epic and tragic gay love story, which nobody has written slash for yet, dammit.)