I watched a match of Ultimate Fighting which is a Mixed Martial Art contest where you are allowed to do most things. You can hit, kick, use elbows and knees even if your opponent is on the ground. You can use submission techniques, such as strangle holds, leg and arm holds ("if you don’t give up I'll choke you to death, break you leg or arm").
In a "sport" like this where you can do pretty much anything you like to your opponent to the gratification of the viewer, imagine my surprise when I discover what you were not allowed to do. You couldn’t use bad language.
In a pre-match interview with one of the contestants, he got a bit excited and stated something along the following lines: "I have complete respect for him (the opponent), but when I get him on the ground he won't be able to do BLEEP."
It seems the producers thought I'd be able to watch him beat his opponents head to a pulp in the match afterwards, but were worried I might take objection to him saying "shit".
I thought the old saying went "sticks and stones can break our bones, but words can never hurt us". The Ultimate Fighting producers seem to think it is the other way around.