The plumber quote is likely ultimately based on this incident between Charles Steinmetz and Henry Ford: http://www.smithsonianmag.com/history/charles-proteus-s

The plumber quote is likely ultimately based on this incident between Charles Steinmetz and Henry Ford: http://www.smithsonianmag.com/history/charles-proteus-steinmetz-the-wizard-of-schenectady-51912022/ http://www.smithsonianmag.com/history/charles-proteus-steinm... One of my go-to stories when telling freelancers not to charge hourly :)