Talking about “Where the wild things are”, here is another gem, “Obluda”, a story contained in the 37th episode of Monster (the anime). Monster is one of the best written mangas, one of the best anime there are nowadays, truly a great watch. This little story is yet another thing that sends shivers up my spine (especially the melodic, feminine voice, saying slowly “bari bari, cusha cusha, baki baki, gokun!”). It is a lot more mature than “Where the wild things are” and it could be compared to the way Mamoru Oshii reinterprets “Little Red Riding Hood” (Perrault’s version, not Grimms’) in his Jin-Roh movie (another classic anime).
I don’t know if the “Obluda” book actually exists or if it was made up by Naoki Urasawa (Monster’s creator), but it seems they were selling it along with one of the Monster dvds in France. I searched a lot, I’d really like to buy it, so if you find anything at all about it, please tell me :)
Later update (24 May 2014)
The book can be found & bought by searching for the ISBN 9784091790279 or 4091790275 (Amazon UK have it, maybe others too). Be advised, it’s in Japanese and the details are for the lenticular, hardcover version (there’s a paperback version too, it seems). You can find the translations for the stories on the Obluda Monster Wiki page.