I second a lot of these books already mentioned....BJD books, Great Gatsby (awesome book!), Catcher in the Rye, 4 Blondes, Breakfast at Tiffany's, She's Come Undone, etc.
Another great book, even though I wouldn't categorize it in the funny or lighthearted reading is "The Joy Luck Club" by Amy Tan. I have read it like 4 times and it is soo wonderful.
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