I am starting a campaign right now with 4 of my room mates. I have never played a single second of an MMO RPG (WoW, Everquest, etc.) and they know that. But one day they were all starting to talk about their characters on WoW and League of Legends. And I started telling them how to better maximize their characters and what role they should be playing when in group activities. It blew their minds and they asked how I knew of this and have never played. I said, "Because I play the Mother to all RPG's, the one they took all of the concepts from". I had them right then and there.
PS. If they are already LARPing on their own and haven't figured out they are nerds...they may be the most oblivious people ever.
And then start them with 4.0 (I swear 4E was designed to convert video game players)