the plural of anecdote is not data
This. So much this. Extrapolating from a personal experience to inaccurate generalizations is such an easy trap to fall into. Gotta stay sharp and watch myself.
This quote really makes the article:
… when I finally had something to show off, my business partner opened the local newspaper, picked a bunch of local plumbers, and called them in an attempt to sell the idea.
He called 10 plumbers. 5 of them suggested he place the idea in an anatomically implausible location. 4 of them had their secretary provide the same advice.