There are in the electrical forums plenty of pictures and examples given to show how existing installations have been wired ranging from bad and untidy to downright lethal.

I wonder if people in here also have similar anecdotes and examples of really awful systems, nightmare programming, or other computer stuff? What made me think of this was the Mainframe thread and that sample I copied up of the worst-written PL/I code in the world -- but that example has been doing the rounds for years, now.