I think some pain you get used to feeling. I have cirrhosis so I've just gotten accustomed to abdominal pain unless it flares up really bad. I hate when you go to the doctor and they ask you to rate your pain on a scale of 1-10. I never know what to say. It's like, it hurts, but I can deal with it.
Most memorable pain I remember though was a sucker punch to the groin. Straight up uppercut, dead on shot. I was on the ground for at least 30 minutes. Hurt like a motherfawker. By the time I could move again, the other guy was gone, not that I was in any condition to fight. I had to go to the bathroom to check on the boys. Thankfully they were just fine.
First time I broke a bone was a beech too. After the first one, the rest never seem to hurt quite as bad.