Sure, hockey and football are physical, but rugby is a sport that more closely resembles a scene out of Gangs of New York than a competitive activity.
Adding to the insanity is the fact that these guys don't wear pads. So, these athletes are just smashing against one another like bloodthirsty lunatics.
In sum, rugby—with the exception of The Hunger Games—is the most violent sport ever.
To support my claim, I submit to you video evidence.
I hope you're not eating lunch.