Je n'en reviens pas - I can't believe it. For a complete list of useful French phrases, get your copy of this essential French phrasebook. essential French Phrases and Expressions to Build Your Confidence in Speaking French.
Of course anyone who loves books buys more of them than he or she can read in one fleeting lifetime. A good book resting unopened in it's slot on a shelf, full of majestic potentiality, is the most comforting sort of intellectual wallpaper.