I recently finished The Wit and Wisdom of Mark Twain, a compendium of the great observer's most notable quotations, and man is this a fun read. The following nugget reflects the book's tenor: "Always acknowledge a fault frankly. This will throw those in authority off their guard and give you the opportunity to commit more."
Enlightening and humorous. Perfect combination. A couple more entries:
"Wagner's music is better than it sounds."
"As an example to others, and not that I care for moderation myself, it has always been my rule never to smoke when asleep and never to refrain when awake."