The discussion centers around the origins of the flushable toilet and its historical figures, particularly Thomas Crapper, who is often mistakenly credited with its invention. Participants mention that Crapper was involved in the design of the London sewer system, while others suggest different names like John or Crane. The term "the crapper" is humorously referenced, and there are playful exchanges about the slang term "john" for toilet, linking it to Lieutenant Jonathan Hooker from the American Civil War. The conversation also touches on the contributions of various nationalities to toilet design, including a humorous note about the Irish and Canadians. Overall, the thread blends historical trivia with light-hearted banter about toilets and cultural differences in restroom practices.