What books made you smile the most while reading them?

Hi! Could you please recommend me the books that made you smile and/or laugh the most, or that made you the happiest while reading or listening to them? To paint a picture: you're listening to a book while walking in the park, and the people are staring at you because you've got a grin so big you're making the Cheshire cat jealous. (happened to me, looking for similar recommendations)