My first IT job out of Uni was being the general IT Guy at a book seller ("Amazon? PAH!" they said...) One of the staff there did desktop publishing on Quark. New version day came along and up rocks me with my selection of CDs and shuffle in the new version, all is well and rosy in the garden. Few hours later I get an irate call from the user saying her monitor (some beast of an Iiyama CRT) has gone all "Wibbly Wobbly" and that its my fault as its the only thing that's changed and that I'm terrible and she's got deadlines and that this is completely unacceptable etc, ad nauseum. Interesting side note here is she phoned me... yet her desk was not 20m from mine, in an open plan office... I digress - I go visit said irate lady, and indeed, her monitor has a proper shimmy on, and the only thing on her computer that had changed was that new version of Quark... the thing that had changed under her desk however was the small fan space heater she'd brought in from home and doing unspeakable things at the Hz rating the monitor was set to. Suggesting her fan was causing the issue did not seem to improve the situation, so I play with the Hz until its stable. As I slink off back to my lair I hear the unmistakable sound of the self righteous "Huh! I TOLD him it was the computer!"