"I.T. people might appreciate this. Back when we used dumb terminals, I put a script in the scheduler to screw with a certain person's terminal at seemingly random times."
We used to have a disk with a script on it. You could load it onto some one's pc. As soon as they returned to work and struck a key, they would get a 'disk error' message. It would say "run disk diagnostic (Y)es (N)o. Didn't matter what key they hit next, they'd get "Running Disk Diagnostic". Then there would be some awful sounds followed by "Hard Disk Dirty Run Disk Washer? (Y)es (N)o. Once again no matter which key they hit, they'd get a series of messages about Wash Cycle, Spin Cycle, Draining Disk accompanied by washing machine sounds. Of course most folks, but not all, would catch on by this time. One person stopped by the boss's office to tell him that he'd had a dirty disk but it was cleaned now.
It's not PC related, but we started talking to each other about the coupon for the free ham or turkey that could be redeemed at the local Piggly Wiggly. All you had to do was ask the project manager for one.
Of course there were no such coupons. But the department fool didn't know that. He also did the paperwork for the sixty inflatable dolls for the company picnic at the instigation of one of the superintendents.