Portal 2 - Weirdest Rat Man Room (Incl. Adam Foster Dev. Commentary)
This is one of the semi-hidden Rat Man rooms in Portal 2 and how I got there (yes, I know there's a faster way, but this is how I first did it). The room contains a whole bunch of coffee mugs, a Rat Man painting, a developer "commentary" from Adam Foster (the source of the Greek mythology influence in Portal 2, fans of Half-Life 2 may be familiar with his "MINERVA" mod). The strangest of all though is the background music. If you get really close to the painting on the wall you can hear a weird crazy man voice in the background.