Speaking of hardware: Always loved this 1998 Australian story (magazine scan or an easier-to-read transcription) of a very particular computer virus that did not require any software to spread “like a Sydney bush fire”:

Now it all became clear. One of the female sockets must have deformed when I first reconnected the CD-ROM burner. This forced the two pins into the same hole and shorted them out. Later when this cable was plugged into the JAZ drive, the pins, now bent to go into one hole, deformed the female connector on the JAZ drive. Again pushing the separating plastic over the hole. Plugging another good cable into this newly damaged socket caused the pins of the new cable to be forced together and short, and when this new cable was inserted into the good SCSI socket on the new JAZ drive it did more damage to it. Before I knew it I had four damaged sockets and three bad cables.

I believe the cables and sockets looked something like this:

The story ends with:

I am only glad the [hardware] virus was contained and did not spread to the rest of the world! Can you imagine if this sort of thing happened in a big computer assembly plant?

Turns out, it did actually happened at a computer assembly plant, in 1997.