My favorite bug report in this vein: https://bugs.launchpad.net/ubuntu/+source/unity-greeter/+bug...

> Steps to reproduce:

> 1. Leave laptop unattended in a cold room with a warm cat.

> 2. Cat will sit on laptop keyboard.

> 3. Wait 1 hour.

> 4. Lightdm will become unresponsive.

Also included: “Alternative steps to reproduce if cat is unavailable or uncooperative about being placed on keyboard (see attached pictures)”