The one that made the biggest impression at the time was 'A Clockwork Orange' by Harpurhey's finest son, Anthony Burgess.
I can understand why Kubrick pulled the film though.
Favourite actual piece of writing is 'The Sun also rises' by Hemmingway.
Sparse, beautiful writing that affected me deeply at the time.
The funniest and most life affirming is probably Three Men In A Boat' by Jerome K Jerome. Showed me that although time passes on, attitudes and humour stay the same. The TV thing with weirdy, beardy and the other one was a bit of a let down though.
That's closely followed by the collected P G Wodehouse golf stories – give it a go, even if you hate the bloody game – his funniest stuff IMO.
Best biography is probably the Spike Milligan War diaries, which I still can't read in public without embarassing myself.
Oh, and 'White Line Fever', Lemmy's autobiography is hilarious. Not, in any way, literature, but bloody funny all the same.
My 'comfort book' is 'The Complete Sherlock Holmes', which I can return to anytime and still find superb.
Scariest by a mile are the M R James ghost stories – best read on your own, at night, under canvas. 😯
And a special mention for the first edition of 'Richard's Bicycle Book', for obvious reasons 😀
By Richard Ballantine, BTW. The later editions are a bit of a let down – less philosophy, more 'what bike for me?'.