Quite by chance, today I stumbled across a story that was old back in my university days, a story about a PDP-10, a hacker, and a magic switch.
The switch was labeled in a most unhelpful way. It had two positions, and scrawled in pencil on the metal switch body were the words ‘magic' and ‘more magic'. The switch was in the ‘more magic' position.
Read the full story here: http://catb.org/esr/jargon/html/magic-story.html