The Jargon File (version 4.4.7, 29 Dec 2003):

SCSI voodoo
 /skuz'ee voo?doo/

    [common among Mac users] SCSI interface hardware is notoriously fickle of
    temperament. Often, the SCSI bus will fail to work unless the cable order
    of devices is re-arranged, SCSI termination is added or removed (sometimes
    double-termination or no termination will fix the problem), or particular
    devices are given particular SCSI IDs. The skills needed to trick the
    naturally skittish demons of SCSI into working are collectively known as
    SCSI voodoo. Compare magic, deep magic, heavy wizardry, rain dance,
    cargo cult programming, wave a dead chicken, voodoo programming.

    While ordinary mortals frequently experience near-terminal frustration when
    attempting to configure SCSI device chains, it is said that a true master
    of this arcane art can (through rituals involving chicken blood, ground
    rhino horn, hairs of a virgin, eye of newt, etc.) hook up your personal
    computer with three scanners, a Zip drive, an IDE hard drive, a home
    weather station, a Smith-Corona typewriter, and the neighbor's garage door.