According to Steve Skeates, Plop! was based around a horror / humor story he wrote called “The Poster Plague”, which was published in House of Mystery.
The title initially was intended to be called Zany. A number of the one-panel cartoons published in the comic included the visible prefix ZA, in reference to the originally intended title. Sergio Aragonés credits publisher Carmine Infantino with coming up with the final title: “Joe Orlando and I were sitting in a restaurant talking with Carmine Infantino. They wanted a magazine that was different, something about black humor. Carmine came up with the name. We were talking about it and he said, ‘What will we call it?’ And I said, ‘We can call it anything, because if the magazine is good, then it will stay.’ And he said, ‘No, we can’t call it, for instance … PLOP!’ And I said, ‘Yes, we can.’ And so I started making sketches of things going PLOP! and they laughed and decided the name was good.
