Back in the day...
The old square metal cased Microvitec CRT monitors had an occasional issue, I believe due to the top connection to the tube being a bit close to the metal case. Occasionally the users would complain of a wobbly picture.
Standard practice was to visit the user's desk and explain that you had to carry out a very technical and delicate procedure that required special training. Once you'd lulled them in to a false sense of security giving the monitor an almighty whack, simultaneously on both sides, would generally cure the problem and make the user jump in the air.
Biting the hand that feeds IT
