Not my own bug, but a bug that happened in some other studio, retold by one of our ex-producers:

Basically the bug was in the Nintendo GameBoy, where it only happens if you press two buttons (left and right, or up and down) at the same time. Now you can't do that normally, since the controller won't allow it. But if you are hard-core QA (as the guy which this producer told me about it) - he ripped the controller, and manually wired some stuff - so he'll get LEFT and RIGHT pressed down at the same time, and only then the game would crash...

But then as we say sometimes here, for such things - it might get the... WNF (Will-not-fix).