Life Changing
These books are what Reddit described as the most life changing. This is pretty similar to Reddit's optimal list of books, including the classics that appear in a lot of lists.
World War Z by Brooks
The Omnivore's Dilemma by Pollan
House of Leaves by Danielewski
The Ultimate Hitchhiker's Guide to the Galaxy by Adams
Ishmael by Quinn
Zen and the Art of Motorcycle Maintenance by Pirsig
Fight Club by Palahniuk
Brave New World by Huxley
Surely You're Joking, Mr. Feynman! by Feynman
A Farewell To Arms by Hemingway
The Demon-Haunted World by Sagan
The Joy Luck Club by Tan
A Short History of Nearly Everything by Bryson
Cosmos by Sagan
The Selfish Gene by Dawkins
The Divine Comedy by Alighieri
Hop on Pop by Seuss
Go, Dog. Go! by Eastman
Stranger in a Strange Land by Heinlein
One Flew Over the Cuckoo's Nest by Kesey
Animal Farm by Orwell
Tao Te Ching by Tzu
1984 by Orwell
Siddhartha by Hesse