Not only did Mathew Perry play beloved antagonist Benny in Fallout: New Vegas, But he was a Fallout fan in general. 

He played Fallout 3 so much that he injured his hands, and on an episode of the Ellen DeGeneres' Show, he gave a signed copy of Fallout 3 and an XBOX 360 to Ellen. Not because he was paid, or was sent to promote it. He did it for the love of the game. 

Bethesda listens to the community. They've put super fans in games before, and Matthew Perry is more than deserving.