Calvin and Hobbes strip, but edited: (dad walks into frame) dad: "Using a file format? lemme show you something interesting" dad: "the two types of file format are .txt and .zip. All file formats fall into these two categories. json? txt. docx? zip" calvin: "...yeah" dad: "xml? txt. apk? zip." dad: "despite containing code, which is usually text, .jar files are .zip" (the final panel is calvin unable to sleep with the new knowledge he's been given)