It should be optional, particularly when you lose a game you definitely shouldn't have! I don't see it being approved by FIDE anytime soon though!
Then again, they did approve that silly rule where you lose a blitz game for taking your opponent's King, so you never know... ;)
I have recently discovered a thing called chess boxing. I have not played it myself (and probably never will) but it seems like really funny concept (no offense). I can just picture two guys beating each other up and then playing a civilized game of chess. I can just see people that are mediocre at chess and mediocre at boxing brainstorming the idea. Here is an article about it: https://en.wikipedia.org/wiki/Chess_boxing
This is a video I found on youtube about chess boxing:
https://www.youtube.com/watch?v=kK5TQSKmS3o