A particular audio recording has been floating around gaming circles. It features a call-in segment from the long-running paranormal-themed late night radio show Coast to Coast AM, founded by the legendary Art Bell and now hosted by George Noory, in which a caller named "Gordon" claims to be a "theoretical physicist" working on "portal technology" at a "research facility," where he is being strangely stalked by a mysterious figure he calls the "G-man."
As far as I can tell, the identity of the caller is not currently known.
This isn't the first time Coast to Coast has been connected to video games. Art Bell himself recorded several broadcasts for Human Head's Prey, serving to update the player on the current events of alien-occupied Earth. A less authentic reference in Rockstar North's Grand Theft Auto: San Andreas is the fictional radio show "Area 53," an obvious take-off on Coast to Coast.
PORTAL TECHNOLOGY, JUST LIKE IN THE MOVIE CONTACT!