I actually have a multiple choice question on my General User training that goes something like:

If someone attempts to elicit classified information from you, and a heated argument erupts, what action should you take?

A) Inform Company Security of the event

B) Provide a non-answer and defer or distract from the current line of questioning

C) Prove them wrong by giving them the classified information

D) A & B

So far no one has chosen C, thankfully.