The only one leaping to mind is The Maltese Falcon. It was an odd progression. On a whim I read some Raymond Chandler novels and absolutely fell in love with his style and how wonderously overblown-to-the-point-of-camp the colourful hardboiled metaphors were. Now, every man and their dog on the internet seems to be agreed that Raymond Chandler is an absolute laughable amateur compared to Dashiell Hammett. So, given Maltese Falcon is by far and away Hammett's most famous novel it was the obvious one to read. I was pretty excited.
The book sucks. Oh my god does it suck. Sam Spade is the most godawful boring Mary Sue lead I've ever read, who effortlessly overpowers every crook he meets and bangs every dame. There's no real mystery - the four characters you meet near the start are about it, and they're all trying to double cross one another to get the stupid bird statue that they have no reason to believe is real. They just constantly meet up in different configurations, point guns at one another and get beaten up by Sam until... I dunno, they get arrested? Now, Chandler plots aren't Dickens but he wrote them well. But I didn't find any piece of Hammett's prose vaguely memorable. It was a staggeringly dull wash.
So I reasoned "Aha, it must be the film! The famous iconic film by John Huston must be so good that it made the book good by association!"
Well, the film is beautifully shot and the cast are excellent and the music is great... really, everything superficial is great but... it's a pretty faithful adaptation. And seeing Humphrey Bogart in live action just constantly, non-stop, with no effort at all overpower all these dudes who have guns when he's unarmed can't really be made not ridiculous. It's like if a weasel-faced uncle of yours made a vanity project film where he gets to be Jackie Chan. I guess these kind of pulpy pseudo-heroics were more passable at the time, but I found it hard to take seriously. The film is unarguably a classic, though, and it launched everyone's careers into the stratosphere so I'm an outlier.