In the very early 90s I put a fake virus on the library computer as a prank. The "virus" was in-memory only and would disappear on reboot. It mimicked the real DOS virus that caused letters to start to drip down from the screen. I was contacted as the resident "computer expert" to come in and fix it. In retrospect I realize two things: 1. This virus was probably the inspirations for the Matrix lettering effect. 2. The school must have known it was me that installed that shit on their computers.