I've had multiple (A) kidney stone episodes; (B) I've smashed my right shoulder into a rock skiing, dislocating the shoulder, breaking the head of the humerus, and spending 2.5h on a rescue sled bouncing down the slope to a waiting ambulance; (C) I've had major impact to my privates. (B) was by far worse than (A), and (C) was way better than either. Several women who have had both (A) and (D) childbirth said that (A) is much worse than (D). So, who knows, maybe (C) is worse than (D) -- I doubt, (D) takes way, way longer from being there for the birth of my two kids -- but the final tally is (B) > (A) > {(C), (D)}. If you want to compete on pain, go smash a shoulder really well.