I had a crazy lacrosse coach once who people claimed was a coke head (apparently it was a pretty commonly held belief) and used to flip out all the time.
One time I had an open man in the crease that, in the pressure of the situation, I failed to see, and could have probably gotten a sweet assist. I played x-attack and was under pressure behind the goal so I just went around and tried to score myself.
Anyway he called me off the field and started freaking out like "WHAT THE FUCK WAS THAT, HOW COULD YOU MISS THE OPEN MAN, THAT WOULD HAVE TIED THE GAME! YOU FUCKING IDIOT!" I'm not sure exactly what he said but it was along these lines. Anyways I just kind of feebly muttered "I'm sorry coach..." and he paced up and down the sidelines kicking shit saying "I'm sorry too, I'm sorry too, I'm sorry too." It just got louder and louder and it was real crazy because he was kind of just saying it to himself with his head down until he was screaming it.
Our other coach had a brain injury and couldn't remember anything or anyones names. One time on the bus he just started calling people out being like. "YOU, I DON'T REMEMBER WHAT YOU DID BUT I DIDN'T LIKE IT"