I didn't make it!
I have been doing a series on Stalker: Call of Pripyat. On a whim I added a color commentary to the latest video and I used software to change the pitch of my voice to do the color commentary. As a result it sounds like I have a crude, wise-cracking chipmunk with me. Everyone who I have shown the video to said it was funny. It is funny even if you aren't a fan of Stalker.
p.s. The color commentary begins about a minute into the video.
Part 6 Color Commentary by Grouchy: Let's Play Stalker: Call Of Pripyat Complete in HD - Part 6 w/ Color Commentary by Grouchy - YouTube