Do you know why the g-man talks like the g-man? The g-man first talked in the maveric half-life 'expansion' which was third party, and thus made in some dude's room at home. Now if you have a mic and some headphones go into the windows microphone config, now try the voice tests. The first test has no playback so get to the second one. Read what they have written there out loud into the mic, you will be surprised what happens... It messes with your head but it is quite cool.