That's a really groovy question - Oh behave! I should thank me for asking... um... me.

(in no particular order) A Brief History of Time, Black Holes and Baby Universes (by Stephen Hawkings), Illusions, Running From Safety, Johnathan Livingston Seagull (by Richard Bach), The Sirens of Titan, Hocus Pocus, Welcome to the Monkey House (by Kurt Vonnegut), Zen Mind Beginners Mind (by Shrunyu Suzuki), That Which You Are Seeking Is Causing You To Seek (I can't remember the author), Words to the Wise (Manly P. Hall), 100 Selected Poems (by ee cummings) Oven Ready Chaos (by Phil Hine)...

I know that there's a WHOLE LOT more than that, but I have trouble remembering back beyond a month or so... some of the books in the list I didn't read all the way through, and a few of them I have read before, but I felt like reading them again because they're all groovy to read.