War and peace, Leo Tolstoy — first mandated by school, the two or three times after university. Because it gives understanding of society, honesty, glory seeking, live and death.
Cryptonomicon, Neal Stephenson — first time during boring meetings on one of my jobs, then again, just for fun of it. The story is fake but plausible.
I am going to reread Zen and the art of motorcycle maintenance again after this post, good memories.