Dr. Barney Barnes: I gave nitrous oxide at first, to get him under.
Inspector Cockrill: Oh yes, stuff the dentist gives you, hmmm - commonly known as "laughing gas."
Dr. Barney Barnes: Used to be - actually the impurities cause the laughs.
Inspector Cockrill: Oh, just the same as in our music halls.
The Hospital Staff - The Doctors: Dr. Barnes: Did you get us here just to insult us?
The Police: Inspector Cockrill: No. I only like to strike an informal note.