Rugby
So you're trying to tell me that giant, muscular men sprinting at one another to try and tackle another person to the ground without any protective equipment is dangerous? Well, actually, yeah...
Consider the Factors
Most serious rugby injuries are either broken bones, paralysis, concussions, spinal damage, and in some cases, death. Roughly 1/4 of rugby players get injured during their season, and, 12 rugby players have died in the past decade due to rugby-related injuries. Protect ya' neck, fellas.