One for the complainers and whingers.
I'm sure some here like me have done teaching in computer or electronics labs. I recall a story told to me by a work colleague, about "the book". Every lab student was allowed just one look at "the book", which guaranteed to show the cause of any problem.
After trying everything possible to convince a particularly vocal student *not* to waste this valuable opportunity, usually the student who couldn't work the oscilloscope, or write a program that didn't crash, or get a straight line plot on a graph as the theory suggested, the teaching assistant would allow them to look inside, to reveal the cause of their problems.
The book, of course, had a mirror inside.
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