"If we could blame the fall of Rome on any two people..."
Storyline
Doc and Fatty have been to see the movie "Who put the table in Nero's stable?". A they leave the theater in a hail storm, a chunk hits the "Ancient Rome" key of their time travelling typewriter, and they find themselves in Rome during the Ben Hur chariot race. They have misplaced the typewriter, so cannot press themselves home, but following the race Ben Hur gives it to them, having found it earlier where they left it.
Story Notes
Letters credit from Todd Klein via his Klein Letters blog (19 September 2016, http://kleinletters.com/Blog/ira-schnapp-in-worlds-finest-comics-part-2/).