The Diary of Adam and Eve - Mark Twain, John Updike
I had read a few books and short stories by Mark Twain in my teens, but I was unfamiliar with this one. I'm so glad I stumbled on it. The Adam portion of the story is one of the funniest things I have ever read. I was actually laughing out loud as I read it.

The Eve portion of the story has quite a different tone. Being from the female perspective, it is a little more introspective and emotional and less laugh-out-loud funny. Nonetheless, the two sets of "journal entries" work well together to poke fun at the differences between the two genders when comparing how the two completely misinterpret each others actions, and can witness the same event and come up with two different versions of what happened. And despite their seemingly irreconcilable differences, Adam and Eve still come to love and depend on each other.