Penny: Hey, you don't need Leonard and his app. You can make one with me.
Sheldon: With you?
Penny: Seriously, I have a great idea for one.
Sheldon: Is it better than your idea to move to Los Angeles and become a famous actress?
Penny: Okay, look. When you see someone wearing shoes you like, you just snap a picture of them, and the app goes on the Internet to find out where you can buy them.
Sheldon: That's your app idea?
Penny: Well, you don't like it?
Sheldon: I didn't say that. But no, I don't.