At the factory, there's a table at the end of the stacker with ball-bearings with pressurized air underneath of them to make the paper stacks glide better across it. When you use two fingers and press down on two of them at the right angle, it makes this Alvin & the Chipmunks roller coaster screaming sound. So I called this guy over and asked him if he knew what the miniature holocaust sounded like. He said no. I asked him to listen closely, and then let off the screams.

Not really a practical joke.

In high school I used to target this girl that sat in front of me in Photoshop class. She was very popular, friendly, and was dating this other retard for like 2 years. She was short, skinny, with long blonde hair. A nice healthy tan; nothing fake. She was a star pupil in many ways. I'm sure many of you are familiar with the 'shutdown -e' command. I had actually pioneered the key to understanding which computers were which strictly by following a series of numbers and letters (you know, what they labeled the computers with). Once I had figured this out, I could remotely shut down any computer in the building. So I'd wait until she was into this project and make sure she didn't save. If she saved, then I'd wait until she made progress without saving. I'd shut her down and watch her get very upset, which was very exciting. It really lubricated something for me. She booted back up, and I did the same thing after she made progress again, because I was now caught in a rush of ecstasy. Very minor ecstasy, but I know the feeling in a spectrum of magnitudes. She whined very vocally, with that fawning girlish expression to the teacher that her computer was malfunctioning. She was moved behind me in the very back of the room. This is where my understanding of machine label patterns came in handy; I just did some quick diagram in my head to ensure that I knew which one she was on, and did the same tit. I did it until the end of class and it was very pleasurable.