Okay-- I know it's not technically a book, but I can't resist talking about Apples to Apples,. This is the most fun game I have ever played. You need at least 3 people to play. The box says up to ten, but it seems infinite. Each player is dealt 7 red cards which contain nouns, such as Helen Keller, Nuclear Holocaust or The Midwest. Players take turns turning over a green card which will have an adjective such as Naive, Angry or Powerful on it. All the players select the card which they think most closely match the green card. The person who flipped the green card that turn gets to judge the match. Sounds kind of dry there, but it really gets fun. Especially if you know the other players well and know the way they think. It's also cool because the judging is completely arbitrary so it's fun to see the logic behind the selections.