I am a HUGE audiobook fan and I can soundly recommend you find the ENTIRE series of this "audiobook" (It is actually a BBC Radio Broadcast prior to it being a book)
The Hitchhiker's Guide to the Galaxy
It's really funny, thought provoking, weird, wild, and unpredictable.
Also, the original DUNE is a good listen.
If you like religious-y stuff, find the Dante's Inferno spoken by John Cleese (I think it is called "The Inferno by Dante")
These are all the kinds of stories that movies have just never quite grasped and all are worth a listen.