A large chocolate manufacturer has bred a purple cow. Really? What do you mean? Check out our introductory video on conspiracy theories! The street survey on the purple cow shows how difficult it is to recognize fake news directly as such. With this casual and non-political street survey, you can easily get into the topic. What is obviously true and what is false? Why do some believe in the purple cow and others don't? Why don't you discuss it with each other in class? or, as a project, conducts such a survey itself and presents the result. Have fun!