My high school started offering it's first programming course in 1988. It was in Turbo Pascal, and it was being taught by a math teacher who knew absolutely no

My high school started offering it's first programming course in 1988. It was in Turbo Pascal, and it was being taught by a math teacher who knew absolutely nothing about programming and was learning out of the book (Borland Turbo Pascal 5.0 [still have it]) at the same rate we were. The classroom was basically a computer room lined with PCs that we all sat in front of. These PCs were equipped with 5 1/4" drives as well as 40 MB hard drives. Being the "hackers" that we were, we downloaded the original version of nethack (early rogue offshoot) off of a BBS with our 1200 baud modems, brought it to school on 5 1/4" disks, loaded it onto the hard drives, and started playing it while the teacher sat at the front of the room with her nose buried in the book, trying to figure out how to learn enough Pascal to offer instruction. Unfortunately, after a while, these mysterious black rectangles started randomly appearing on the screen, and the PCs started experiencing performance issues. Nobody could figure it out. After many months, it was determined that we had infected all of the computer with the Jerusalem virus (in 1988!). Soon after, a school-wide prohibition on installing your own software was implemented (though not followed).