My last game I ever umpired, the one that threw me over the edge, was during a 9 year old fall ball game.
The two head coaches apparently knew each other, because they were joking around with each other the entire game. This included mocking my calls, and disrespecting me as an umpire. After the 4th inning, I called both coaches to home plate. I said "I will not tolerate any more mockery of myself, or the game of baseball. One more word out of either of you and you are both ejected, and you both forfeit."
As I walked to the backstop to get some water, I heard one of the coaches say to his "buddy", "Who does this punk think he is?! He needs to learn some respect!"
I had had enough at this point. I went to home plate. Yelled "Time Out!". I then said "You're gone, and you're gone" (directed at the 2 coaches). I then walked off the field and found the tournament director who then forfeited both teams.
Later on, the TD said that he had had problems in the past with these 2 coaches. I had 0 fun that day, and I refuse to umpire again.