War story: ca. 1980, before PC meant IBM, there were many teams rolling their own personal computers. In one of which I'm aware, the hardware people attempted to play a practical joke on the software people by swapping the leads on the CRT yokes every once in a while.

It didn't pay off though: the software people quickly had a flag in their driver, and just absent-mindedly flipped it whenever they came in and their screen was displaying upside down, then carried on working as if nothing untoward had happened.