What caused the most physical pain you've ever experienced?

medz thought this was worth mentioning said
5

I recently saw someone talking about the most painful thing they’ve ever experienced. Thinking about it, I didn’t really know what mine would be. I’ve had a collapsed lung + surgery to prevent it, a kidney stone, and a vasectomy. I suppose it’s probably one of those, but I don’t really remember which was the most painful. Maybe I just have a tendency to block-out unpleasant memories. What was your most painful thing?