“A crazy mixed-up day : Thirty brainteasers“ is one of the almost ninety broadcasts for chidren that Walter Benjamin, one of the most influential of 20th-century thinkers, wrote and delivered over German radio from 1927 to early 1933. Transmited between Radio Berlin and Radio Frankfurt, Benjamin’s broadcasts covered a fascinating array of topics: the Lisbon earthquacke, the eruption of Vesuvius, the flooding of the Mississippi River, and many many more. In this particular text, Benjamin proposes a intriguing and funny story about Heinz who is looking for the solution of a riddle. As we read along we need to find 15 mistakes and try to answer 15 questions. Each correct answer to a question gives you two points, because many of the questions are more difficult to answer than the mistakes are to find. All solutions are presented in the end (no peeking). Do you accept the challenge?