Sheldon: I promised Penny.
Leonard: Promised Penny what?
Sheldon: I wouldn't tell you the secret. Shhhhh!!!!
Leonard: What secret? Tell me the secret.
Sheldon: Mom smokes in the car. Jesus is okay with it, but we can't tell dad.
Leonard: Not that secret, the other secret.
Sheldon: I'M BATMAN!!!! SHHHH!!