It's called a 'Tell' in gambling when someone has a characteristic behavioral quirk that gives away whether they're really strong or just bluffing. The same is true in interrogation and investigative or judicial questioning of course, though the language describing that tends to be a bit more high-flown and professional-sounding.
It's also true in politics, the common joke being simply that the politician's lips are moving (Certainly the case with Bill Clinton).
I've noticed a particular tell of Hillary's, which is her insane cackle. It hardly ever happens when she is asked a question that she wants to answer, or the answer to which will reflect well on her or her record. When she gets a toughie, the kind where a truthful answer will NOT help her at all and likely do damage, you'll notice the following sequence:
Her head tilts back;
Her eyelids raise;
Her pupils remain looking at the questioner;
Her jaw drops open like an anaconda about to devour a capybara;
Insane cackle commences;
Deflecting remark that has almost nothing to do with the question asked comes out of her mouth;
Insane cackle apparently affects brain cells of interviewer and breaks concentration so line of questioning is not pursued.
I have to say, that last part seems to work pretty well. I have seen that blood-curdling, pain-inducing cackle again and again, there is practically never a reiteration of the question or a pressing follow-up question. Bitch skates.
