Sheldon: Uh, don't worry, Leonard, you're still my California best friend.
Leonard: Cool.
Sheldon: So, what do you want to do now? Go to the train store, go to the comic book store?
Tam: Actually, I have to grab my son and head to the airport. I was just about to call a cab.
Sheldon: Don't be silly, you don't have to call a cab. You're my oldest friend. Leonard will take you. Right, Leonard?
Leonard: Sure.