If you have not seen them, these are enlightening: http://www.catb.org/jargon/html/koans.html http://www.catb.org/jargon/html/koans.html I especially like the

If you have not seen them, these are enlightening: http://www.catb.org/jargon/html/koans.html http://www.catb.org/jargon/html/koans.html I especially like the power-cycle one, due to spending plenty of time in a lab debugging circuits.