originally coined the term. [6] Some examples of MacGuffins in movies: The meaning of rosebud in Citizen Kane (1941). [11] The top secret plans in The 39 Steps (1935). [12] The eponymous statuette in The Maltese Falcon (1941). [13] The letters of transit in Casablanca (1942). [14] The uranium in Notorious (1946). [15]