I was playing at a basketball camp in high school. During the late night games (after 8 or so), got elbowed in the mouth. Took a minute to realize that my braces were impaled through my upper lip. The way they were stuck made pulling my lip out a non-starter; it would have been a bloody mess. Coach took me to the nearby hospital to hopefully do a couple of quick slices with a scalpel to get my upper lip free.
The hospital was basically closed for the night, so I waited for the doctor to get everything ready to do the procedure. First, doc numbs my lip from the right side. Then starts cutting from the left. I immediately felt quite severe pain. I didn't figure it out right away, but the left side of my lip was not numbed. I just laid there while she cut my lip off of my braces. It was incredibly painful, but I was unable to speak and afraid to move because there was a sharp knife moving around in my mouth. So I just squeezed the hell out of the handles on the side of the bed, and shot angry eye daggers at the doc. A couple of minutes in, she got to the part that was numb, and all was okay. Hearing the scalpel scrape against my teeth was a little bit weird, but I was so grateful that the anesthetic was working on the rest of my lip that I didn't care at all.
Wow, there are some gnarly ones here. I think the worst are the ones where you guys have to suffer for hours or days. Intense pain is bad, but if it is over relatively quickly, it's not a big deal. The ones that last are another matter.