Seriously.... I like a lot of books for a lot of different reasons. At the moment Sophie's World springs to mind but it didn't change my view on life much. I've just finished Memoires of a Gnostic Dwarf... that's very interesting. Interesting way of looking in to the reason God made the world.
Dead Babies & Yellow Dog - Martin Amis
A Star Called Henry
Something Happened - Joseph Heller
Anything by Patrick Hamilton or George Orwell
There is a brutal honesty of thought in these books that is shocking in its intensity and brutality (Amis & A Star called Henry) and perhaps defines the human condition more than any other I have read. The Amis's I also found quite shocking, which is very unusual for me.
Graham Greene's book about his novels gave me a whole new perspective on his writing. His novel The Quiet American gave a great account of war and foreign influence.
These tend to be books that give some deeply held thought or feeling from the author that goes beyond what social mores allow and so exposes them
The first such book (corny it may be but no less important) was A Tale of Two Cities - it made me realise I am not the most important person in everyone else's world and that only by some self-sacrifice will the world ever really improve
In no particular order;
Catch-22 Joseph Heller
The Ragged - Trousered Philanthropists Robert Tressel
Dice Man Luke Rheinhart
The Blind Watchmaker Richard Dawkins
Various Poems, mostly Phillip Larkin and Wilfred Owen.
MASH Richard Hooker (?)
Cider With Rosie Laurie Lee
All Quiet on the Western Front Erich Maria Remarque
The unbearable lightness of being - Milan Kundera
Only Forward - Michael Marshall Smith
The childrens SciFi of Andre Norton
The first "Yes Minister" book. There's a bit in it where there's a transcript of a supposedly "unbiased" TV news report, and then on the next page it points out how the report is actually biased in one direction, and follows it with a script of how it would have been done (still superficially appearing neutral) to bias it in the opposite direction. With that bit of education under my belt, nowadays I'm very good at spotting bias in BBC news reports!
Something Happened is an odd book. Nothing like Catch 22 and for the most part nothing at all happens, but something in it struck a nerve and it feels like its a deeper, more honest book. Having said that I almost gave up on it, but there are a couple of parts that stick with me 18 years later. It's a lot more about feelings than Catch 22- if you like that sort of book it might strike a nerve.