Following
The Day of the Triffids 
By John Wyndham
Great if you like post-apocolyptic fiction, which I do. The Kraken Wakes is another good one by the same author.
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Cat's Cradle
By Kurt Vonnegut
"Oh, a sleeping drunkard
Up in Central Park,
And a lion-hunter
In the jungle dark,
And a Chinese dentist,
And a British queen--
All fit together
In the same machine.
Nice, nice, very nice;
Nice, nice, very nice;
Nice, nice, very nice--
So many different people
In the same device."
A gift years ago from the wonderful Mr Rigozzi. Love it.
The End of Mr Y
By Scarlett Thomas
This book messed with my head in a super satisfying way.
The Time Traveler's Wife
By Audrey Niffenegger
Oh I love this book. I haven't watched the movie because it looks like they just made it into a sappy girly story. And the book is so much more than that.
Cloud Atlas
By David Mitchell
Took me a few pages to get into it, but it was so worth it. It is just beautifully written and very clever and unique.