One of my friend's dads used to say to him;In the 'I never thought I would' category of parenting:
I discussed with my son the negative aspects of hitting your jaw with a hammer. He doesn't do it but was well aware of it and why young men apparently do it to improve their good looks. It's a trend on social media known as bone smashing.
SMH
I was patient and did not point out that dudes who do it also eat stupid sandwiches for lunch.