[bitwize]

Dividing by 3 is hard, man.

While an engineer at Xerox, my father modified an electromagnetic calculator to turn it into a form of stored program computer (similar in form and function to the Olivetti Programma 100). While experimenting with the calculator he found a way to crash it: divide 10 by 3.

He got a patent for his electromechanical computer invention, for which Xerox paid the standard nominal fee of $1, but it went nowhere.