Leonard: I checked the App Store. No one is doing handwriting recognition differential equation solving.
Sheldon: Oh, dear Lord, shush.
Sheldon: You have so few good ideas, Leonard. And you're just going to spill the beans in front of an outsider?
Penny: Who, me?
Howard: Sheldon, I don't think Penny cares about handwriting recognition-based differential...
Sheldon: (singing over them) The stars at night are big and bright, deep in the heart of Texas.