Groucho, Harpo and Chico, the three Marx brothers, entertained cinema audiences for decades from the 1930s onwards. They started out as vaudeville performers on stage and eventually moved on to the big screen. In Swedish, the films were given titles that began "En dag på...". In the crazy and completely irreverent company of the comedians, we visited the racetrack, the opera and the department store among many other things. Here is the truth behind the scenes that became little comic gems, legendary even today.