3. Blood sacrifice
Balinese demons are one thing, but some geeks turn to even darker powers to help them in their times of need. Pete Warden, now a software engineer at Apple, mentions sinister doings at a previous gig. "Part of my job was testing graphics cards, which meant pulling them in and out of machines all day. It was very fiddly, and the widely accepted rule was that any given card wouldn't work unless you'd cut yourself at least once trying to wedge it in. They all needed a blood sacrifice."