Adam was happy when Nathan gave him back his dentures.

Nathan(pondering): "Yup. Botox."

Nathan- I'm teling you, If we were conjoined twins, I could think smile and you would do this.

NATHAN: Baby smiles like this, it's usually assumed to be gas

Nathan: Drop it! Drop it I say! Good Adam! *pats head*

MAL: "What do ya say, Doc, is this sewn shut neatly or what?!"