Many years ago a colleague and I serviced a laser printer (they were 600 grand a pop). Test everything is working properly, hand it back to the customer, leave the premises.
An hour or so later, the same customer puts in a service call because the prints were horribly skewed. Couldn't fix it over the phone so back I go, only to find the guides in the paper tray were nowhere near the edges of the paper.
Definitely my quickest fix ever. The look on the clown's face was priceless when I showed him the "problem".
Biting the hand that feeds IT
