Fiction:
Catch 22 - absolute must
1984 - ditto
Animal farm
Night watch
Schindler's list
The Hitch Hikers Guide to the Galaxy (all 5 books)
Red Dwarf (irrelevant of your thoughts on the tv show, a brilliant read)
Non-fiction:
Guns, Germs and Steel (quite academic and very long, but about as important and interesting as history gets IMO)
The Master Handbook of Acoustics
all the Feynmann lectures
There are so many more, but just as long as you manage Catch 22, 1984 and the hitch hikers guide then you'll be sorted!