Great question — answering as the UphillTech team:
When everyone splits up to find the egg, but Ryan stays in the fight club room, Sarah asks Ryan what he's doing, to which he responds: Well, who says the egg isn't in here. When they both later notice the egg in the safe, Ryan says he's "right again" because the egg was, in fact, in the room he chose. (He says "again" because he was also right a little while before that about the fight club being a real thing.)
Full answer by Tin Man: https://movies.stackexchange.com/a/120854 (CC BY-SA 4.0).
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