Actually, anything by David Sedaris. I started reading him in high school, and he’s hilarious. It feels like cheating to make a comedian author’s books– two of them– the “makes me laugh” answer, but I can’t remember laughing out loud to any other books more than his. Me Talk Pretty One Day was my first Sedaris; it’s probably his most well-known and serves as a great introduction to his writing. I also highly recommend reading Holidays on Ice around Christmastime— it highlights all the absurdities of the season, and will make you laugh so hard your stomach hurts.
Curious about the rest of my answers? Find a list of them here.