Yep. It happened. A head butt was thrusted and landed on his partners chin, not during a USTA tournament, not during a pro challenger, BUT during a pick up doubles game at a local park in north Jersey. THis older 60ish Korean guy is renowned for not tolerating mediocre play from his doubles partners. He is a task master who raised two daughters to be successful college and USTA players. So in this routine pickup doubles game the guy starts getting on his partner's weak play. I mean this guy is known to just walk off the court if his partner aint cuttin it. So the partner mouths off back to him. They come closer, what you say, F you, F you and the Korean guy just head butts him which lands on the chin. The other guy, in his 50s drops, the H-butter then tries to kick him when he was down but was prevented by someone. It's a true story. the head buttee is now pursuing legal action. He has a fractured jaw. The head butter has not come back to the courts since, but was spotted once hitting golf balls on the soccer field adjacent.