What was the most physically painful experience you have ever had?

The hardest physical pain I have ever experienced happened when I was a kid. I injured one of my fingers with a fan and even to this day I remember how much I screamed. I didn't break a bone or anything but I did cut my skin very deep.

Another painful experience was when I bruised my balls when I was a kid around 10 or 11yo. I was playing football and I received a fault. When I went to the ground my balls were between my legs and got squeezed hard. I got bruises for more than a week I was actually very worried at the time but things were all right.

What about you, what was the most physically painful experience you have ever had?