Sheldon: At grad school, everybody's going to be smart. If I'm not the youngest, how am I gonna stand out?
Missy: Sheldon, you're a kid talking about going to grad school. You have no problems.
Sheldon: I knew you wouldn't understand.
Missy: I do. Instead of being a kid genius, you're worried you're just gonna be a regular genius, which is a stupid thing for a genius to worry about.
Sheldon: Well, stupid or not, I may not get to go to Caltech until I'm 15.
Missy: Wait, this is about when you move out?
Sheldon: Yes.
Missy: I take it back, this is a big deal.