Oh man there's no way he's a closet geek, he wears that shit proud. He makes everyone who's anywhere near the living room come in and sit down when Mythbusters is on, and makes bets with them over which myths will be busted and which will be confirmed. And he is so triumphant when he's right despite the fact that by that time, everyone but Peter, who's actually interested, and Steve, who's too amused by Tony's excitement to leave, has escaped. He gloats to them later about his being right, and they don't even remember what he's talking about.