I'll probably get shot for admitting this but "Stranger in a Strange Land."
I could never finish "Catcher in the Rye". It bored me to tears. I only tried because you always hear that its such a classic. I don't get it.
I haven't read Snow Crash (though it's on my list) or The Diamond Age (I'll have to check that one out).
Crypto is a hard one. If you don't like math or history it's going to be a non-starter. It also took a long time to "get going". I wanted there to be a "point" but it didn't start coming together until about a quarter of the way through the book. After I got about a quarter way into it, though, I didn't want to put it down. I got REALLY into it (though the ending still bothers me). It's a book that I only recommend to certain people that I know REALLY well.
Same here. Wanted to read it for the same reasons, and I was going through the list of 'banned' books because if someone wants to ban them then they must be interesting in some way. Gave up pretty quickly.
The house of the seven gables
The Stand
The Chronicles of Thomas Covenant The Unbeliever. (There are like a dozen of these cursed things, Google it if you're too young to remember but they were HUGE in the 70s.)
MOST UTTERLY ****ING FRUSTATING AND DEPRESSING GARBAGE I HAVE EVER READ. Uggh, still haven't got the bad taste out of my mouth.
I'm not going to list HIgh School reading list stuff as I passed with flying colors using my method of only reading the first 4 chapters and the last 4 chapters of any of those books.
"The Witching Hour" by Anne Rice. Made it 100 or so pages in and couldnt do any more. I was surprised too as at that point I had read all her Vampire books and liked them all.
"Koko" by Peter Straub. I read about 15 books in the time it took me to almost finish that one. I dont like to give up on his stuff as it usually pays off in the end but this was a snoozer.
Does it count if someone steals the book from you when you are part way through and never got to finish it? If so, then "Under The Dome" by Stephen King. I have since reacquired it but haven't gone back to finish.