While preparing to film a movie entitled A Night in Casablanca, the Marx brothers received a letter from Warner Bros. threatening legal action if they did not change the film’s title. Warner Bros. deemed the film’s title too similar to their own Casablanca, released almost five years earlier in 1942, with Humphrey Bogart and Ingrid Bergman. In response Groucho Marx dispatched the following letter to the studio’s legal department.

Dear Warner Brothers,

Apparently there is more than one way of conquering a city and holding it as your own. For example, up to the time that we contemplated making this picture, I had no idea that the city of Casablanca belonged exclusively to Warner Brothers. However, it was only a few days after our announcement appeared that we received your long, ominous legal document warning us not to use the name Casablanca.

It seems that in 1471, Ferdinand Balboa Warner, your great-great-grandfather, while looking for a shortcut to the city of Burbank, had stumbled on the shores of Africa and, raising his alpenstock (which he later turned in for a hundred shares of common), named it Casablanca.

I just don’t understand your attitude. Even if you plan or releasing your picture, I am sure that the average movie fan could learn in time to distinguish between Ingrid Bergman and Harpo. I don’t know whether I could, but I certainly would like to try.

Groucho Marx to Warner Bros