"per hour labor rate:
$50 standard work
$75 if you watch
$100 if you do the work
$150 if you try first and get it wrong"
That's an old joke, I've seen various forms of it in many garages, plumbing companies etc. Anywhere that a do-it-yourselfer either tries to get free instruction, or a cheap fix for a botched repair.
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"...perhaps the world needs a little more Canada" - Jean Chretian, 2003.