Interesting...I never thought about this, but I guess it fits.
I've been a computer repair technician for 12 years, one of the best in this area, built at least a hundred computers, including every one I've ever owned, except the first one.
Over the years I've been sparring partner for two martial arts experts, one a black belt, the other an instructor. No, 3, also my brother when he was a beginner. Although I have virtually no training, I was pretty good at it. The first one loved it because I was the only one he could find who could actually land a punch now and then. we pretty much beat the crap out of each other even though neither was trying to, but enjoyed it. He landed a kick one day to my chin that knocked me down...by accident... I leaned a bit just at the right time and POW...yeah it hurt, but we laughed it off and went right back to kicking the crap out of each other.
The instructor was a bit different, he had a bookshelf full of trophies, some from Thailand, dating back to 1963, (this was in Houston about 1990-1992). He would hand me a pair of practice pads and boy am I glad...if he had ever actually hit me I would have been in intensive care...hopefully George would have been on duty.

It was crazy, but we usually went to Hermann Park, bad place to be after dark...First time he stopped there I asked him if he was crazy...he said who's going to mess with me??? Oh...ok...the guy was bad to the bone, but a great friend.
Oh and did I mention I'm also a guitar player?
