I thought this was an interesting link
http://flavorwire.com/394100/classic-books-annotated-by-famous-authors/4
I found Mark Twain's annotation of Plutarch's lives of Illustrious men funny.
Here's another with Hitchens on The Great Gatsby
http://www.vanityfair.com/culture/2013/05/Christopher-hitchens-handwritten-notes-great-gatsby
http://flavorwire.com/394100/classic-books-annotated-by-famous-authors/4
I found Mark Twain's annotation of Plutarch's lives of Illustrious men funny.
Here's another with Hitchens on The Great Gatsby
http://www.vanityfair.com/culture/2013/05/Christopher-hitchens-handwritten-notes-great-gatsby