I've just finished reading "Let's Pretend This Never Happened (A Mostly True Memoir)" by Jenny Lawson, and if you want to laugh your head off, read it. (new, under $9 from Amazon).
The only time I remember laughing harder was when I read the second volume of her memoirs, "Furiously Happy: A Funny Book About Horrible Things" (new, under $11 at Amazon.
Why did I read the second volume first? Because I found it on sale in an airport bookstore, so I read it, embarrassing myself as I chortled and chuckled and howled with laughter on my ride home. So then I looked for the first one. It isn't as funny, but you still might want to read it first. Nah, forget the first one, just go ahead and read "Furiously Happy." Really.
Meanwhile, I've been reading Gloria Steinem's "My Life on the Road," which hasn't left me in stitches with laughter, but has been considerably more edifying and enlightening (new, just under $11 at Amazon). And it also isn't full of the f-bomb and other vulgarities which, although sometimes hilarious, did detract from my enjoyment of the two Lawson books.
But I do recommend all three.