I've posted about this before, but it's always worth repeating. My all time favorite martial arts memory of all time was watching a belt test. Two guys were sparring: one this absolute behemoth of a dude, like 300 pounds, nearly even my height probly 6'3 or so, another a super friendly high school kid. They were doing the sparring portion of the test. Keep in mind this is a TMA, so it's basically a formality. All you have to do is like throw a punch and you pass the test, you've already done the "requirements" portion of the test.
Anywho, 300 pound monster guy accidentally/intentionally launches a low kick directly to the nards of the high school kid. HS kid turns around and doubles over in pain and stumbles across to the other side of the gym. Then -- in the greatest moment of my life -- rather than stopping and bowing or just giving him some space, behemoth dude does this insanely unathletic running flying front kick to the taint of the back-turned high school kid and literally lifts him off the floor by his asshole. The old school judging Korean masters made literal :O faces. I have NO FUCKING IDEA what was going through behemoth's mind. It was one of the most surreal moments of my life, and it's hard to think about without tearing up from laughter.
At another time, behemoth was trying to spar me and kept punching me in the nards and kicking my knees so I threw a back kick and accidentally broke 3 of his fused ribs. Karma.