The more annoying bit...
Is when the tech does the magician shit all by itself. I've lost count of the number of times that me simply walking over to a computer 'fixes' whatever problem the user is having; we even informally use the term 'IT Guys Present' as the 'solution' when this kind of thing happens.
That adds a lot of techno-magi reputation even without casting the runes on the users desk and chanting the incantations or what have you. I generally try to be honest with my users, and try to explain what caused a problem in layman's terms, but that's kind of difficult when the only apparent explanation for a problem suddenly resolving itself is 'I guess the machine just wanted me to touch it today'.