Sendak, Maurice "Where The Wild Things Are" - 1963
I think everyone born after the year 1960 must have had this book read to them when they were little. At least those in the English speaking world. Even though it has been translated into several languages in the meantime, I don't think it was around when I was little.
Anyway, the story reminds me a lot of the fairy tales we used to listen to and read when we were little. I loved them all but never became a fantasy fan. But this story is different, it IS a fairy tale, even though it wasn't written at the times of the Brothers Grimm.
Definitely a classic that is still worth picking up.
According to Wikipedia, "in a 2012 survey of School Library Journal readers, it was voted the number one picture book - and not for the first time."
From the back cover: "One night Max puts on his wolf suit and makes mischief of one kind and another, so his mother calls him 'Wild Thing' and sends him to bed without his supper. That night a forest begins to grow in Max's room and an ocean rushes by with a boat to take Max to the place where the wild things are. Max tames the wild things and crowns himself as their king, and then the wild rumpus begins. But when Max has sent the monsters to bed, and everything is quiet, he starts to feel lonely and realises it is time to sail home to the place where someone loves him best of all."