In 2004, Roger Ebert wrote A Viewer’s Companion to Citizen Kane. It starts off:
“Rosebud.” The most famous word in the history of cinema. It explains everything, and nothing. Who, for that matter, actually heard Charles Foster Kane say it before he died? The butler says, late in the film, that he did. But Kane seems to be alone when he dies, and the reflection on the shard of glass from the broken paperweight shows the nurse entering the room. Gossip has it that the screenwriter, Herman Mankiewicz, used “rosebud” as an inside joke, because as a friend of Hearst’s mistress, Marion Davies, he knew “rosebud” was the old man’s pet name for the most intimate part of her anatomy.