About a year ago, I created this for the loud, annoying guy in a cube near mine who has no "inside voice." I had forgotten all about it until I was doing a search on my hard drive for a particular graphic file.
I figure I'm probably not the only one with a need for something like this, so I thought I'd share. I never actually used it, because I moved to a different cube to avoid going postal. Your mileage may vary. Don't get face-punched is all I'm saying.