Sentence: If any one asks you who your master is, answer: the Marquis of Carbas.

[Sonia*]

Hello sir, hope you are doing up to the mark. Please tell me the meaning of a sentence in this context with that I came across while reading a funny story:

"If any one asks you who your master is,answer:the Marquis of Carbas.
otherwise you will all be sorry :?: :?: :?: "

"you all will be sorry" is it an idiom :? please define it full well with some instances :?:

thanks a million!

[Milanya]

Sorry - feeling regret, compunction, sympathy, pity, etc.: to be sorry to leave one's friends; to be sorry for a remark; to be sorry for someone in trouble.
http://dictionary.reference.com/browse/sorry?o=100074

You wil be sorry - you will regret it.
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con·text - The part of a text or statement that surrounds a particular word or passage and determines its meaning.

[Sonia*]

you will be sorry - you will regret it.
If I am right it means " something unfortunate will be brought to you." Sorry to bother you, I am not getting the meaning of it.

I mean in what sort of circumstances I can use this sentence.
Does this sentence possess negative meaning according to the situation.

(If any one asks you who your master is,answer:the Marquis of Carbas.
otherwise you will all be sorry)
please reply.
sonia*

[Yuri Yurinov]

Dear Sonya,

You can use this expression when you want to frighten somebody or prevent one from doing something foolish or bad.
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Everything is Anything.

Please NO Youtube on "My first steps in English" thread...