Love that one.
A contract programmer at work wrote an application for us, but there was a field where it would sometimes be necessary for the user to enter 0.
The program had a bug though, and entering zero would cause a crash. Rather than fix the problem, the first version we were shown simply popped up a window that said "Value cannot be zero," so you'd have to enter an integer higher than zero, and this person thought that was an acceptable patch.

Christ, if I'm working on a small microcontroller with only a few kilobytes of program memory, I still have to ensure that variables going to zero won't cause a crash.
I'm also the one who, when shown a new program meant for quick internal use, and I see a field that says "Enter length dimension," I'll enter "no" or "1.23.1.2" and see if it can handle it without crashing. :awe: