Reminds me of the bit of business from Pirates of penzance:

GENERAL STANLEY: Tell me, have you ever known what it is to be an
          orphan?
PIRATES: (disgusted) Oh, dash it all!
KING:    Here we are again!
GENERAL: I ask you, have you ever known what it is to be an
          orphan?
KING:    Often!
GENERAL: Yes, orphan. Have you ever known what it is to be one?
KING:    I say, often.
ALL:      (disgusted) Often, often, often. (Turning away)
GENERAL: I don't think we quite understand one another. I ask
          you, have you ever known what it is to be an orphan,
          and you say "orphan". As I understand you, you are
          merely repeating the word "orphan" to show that you
          understand me.
KING:    I didn't repeat the word often.
GENERAL: Pardon me, you did indeed.
KING:    I only repeated it once.
GENERAL: True, but you repeated it.
KING:    But not often.
GENERAL: Stop! I think I see where we are getting confused.
          When you said "orphan", did you mean "orphan",a person
          who has lost his parents, or "often", frequently?
KING:    Ah! I beg pardon- I see what you mean -- frequently.
GENERAL: Ah! you said "often", frequently.
KING:    No, only once.


Cheers
Nigel