Oh I've got a great story for this.

A few years back I had to have my wisdom teeth removed, as they were all coming in wrong; the top two were a bit slanted, but the bottom two were impacted, and were actually growing forward into the teeth next to them. I got put under for my surgery, so I didn't have to be awake while they cut into my gums and extracted my teeth in pieces.

Now, the doctors told my mom that I was going to be in pretty severe pain when the Novocaine wore off, so they perscribed me vicodin and told me to take some before the numbness went away. Unfortunately, I didn't eat anything that day, since I had to have an empty stomach to be put under, and vicodin on an empty stomach doesn't mix well. I spend that entire evening vomiting every hour, which ripped the stitches on my bottom gums. Hurt like fuck. Not to mention that my jaw was already swollen near shut from being cranked open during the surgery.

What was really awesome was what happened a week later. I was at school and randomly realized I could taste blood, and when I ran my tongue back over my gums in the back of my mouth, I felt something sharp pointing out. The gum was pretty sore as well, so we scheduled another appointment and went back to the hospital. They told me that the bone in your jaw around your teeth is relatively soft, and when teeth are removed, the bone can sometimes expand. The sharp bit poking out of my gum was part of my jawbone that had expanded. The doctor told me the only real way to deal with it is to break off the bit of bone that was sticking out.

So, he laid me down in the chair and gave me a shot of Novocaine. Only problem is, he numbed the wrong nerve. When he came back, I told him I could still feel the whole gum area, but he told me it was just my nervousness about oral surgery. He grabbed a little pair of something-or-another and began tugging on the bit of bone poking out. I quite loudly told him I could feel it, and he told me I wasn't feeling pain, only pressure. He then began to attempt to break the bone out of my mouth. I could feel everything. I began screaming until the whole hall could hear me, and he finally backed off and gave me another shot of Novocaine that numbed the entire left side of my face. He then had no problem breaking the bit of bone off and packing my bleeding mouth full of gauze.

I'm sure breaking a bone sucks, but having someone purposefully attempt to break part of your bone off while you can feel every bit of it is easily the worst pain I've ever experienced in my life.

I have sprained an ankle, and while it did hurt, it was more of a burning sensation, and not nearly as sharp or excruciating as the jawbone incident.