Someone with too much grant money and too much time decided many years ago that simply asking a patient about the amount of pain they were in and sprinkling in a good dose of clinical judgement was not good enough. After years of research various pain scales were born; the "visual analog" or "one to ten" scale being the ones most commonly used in the ED. Most ED docs love these scales and use them at every opportunity (as long as we have picked all the lint out of our belly-buttons).
Wikipedia has a nice little blurb on these scales which can be seen by clicking the above title. One of the things that all these pain scales have in common is a complete lack of objectivity and reproducibility between patients. Here's where the math comes in and stay close 'cuz I'm about to throw some mad knowledge your way.
It is impossible to have "1,000,000 out of 10" pain just as it is impossible to have 12 out of 10 pain etc... It fires every passive-aggressive neuron in my very male brain when I have to wake you up from your substance-induced slumber only to have you tell me that you, at that very moment, are having "12 out of 10 pain". "Yes", you say in response to my question, pain that is every bit as intense as if I were, at that very moment, sawing your leg off with a chainsaw (as seen in Scarface which is the usual example I give someone to illustrate something that might approach "10 out of 10 pain").
When you tell an ER doc or nurse that you have "20 out of 10" pain you are not impressing anyone. If you had "9 out of ten" pain you would be crying, probably vomiting, and barely able to speak. If your demeanor, facial expressions, vital signs, level of alertness, and story do not add up to even two then you will be immediately relegated to the "not sick bullshit pile" and treated with all the urgency demanded by your presentation.
If I'm feeling frisky I might decide to play possum with you where I say "screw my patient statistics, I'm keeping this jerk here until he gets tired of getting a different non-narcotic medicine every hour for his "pain" and signs out AMA."
Now we all know what you mean when you do this. What you are engaging in is called "hyperbole". Dictionary.com defines it as follows; "Obvious and intentional exaggeration."