A boxed set of CS Lewis's The Chronicles of Narnia when I was 12. 6th grade. Maybe 1978? I came from a big family, near the bottom, so we hardly had anything we could "own" as individuals -- it usually got used up too fast or broken or lost. And we had one bookcase in the house for the encyclopedias and the Reader's Digest Condensed Books. I think I'd read maybe the first book of the series, knowing there were seven. I remember telling my mom that's what I wanted.
And I knew what the boxy gift was, all wrapped up under the tree. Only heightened my joy at unwrapping it and knowing all seven books were there for me to read and read again and protect from my godawful siblings. I loved them so much -- even though I knew when I read them that they were subversive (that kid that gets the bye because he served an evil god? Yeah, that's not happening in real Christendom. If jesus ain't your way, you got no way). What I loved even more for the story was CS Lewis's Space Trilogy, which I acquired sometime later. Introduced me to science fiction, which I've always loved more than fantasy. Except for that boxed set.
Anyway, my mom died a Christmas and a half later. I always associate those books with her, because I'm sure I had other things on the list and somehow she knew they would be the things that stuck.
And when the collector's edition came out ten-twenty years back or so, I discovered that my set was not the way the author intended, but in chronological order of the events in the books. Ever since then, you pick up a box set and the order's all screwed up. The movie's ain't bad, but they're not the worn out boxed set that's been on my shelves ever since that Christmas.