Use of or lack of use of voice.

[legend]

Personally I find that being vocal in the first 2 min. or so of the game allows for alot less whistles through the course of the game. Expecially as L with the post play. Your voice helps set the tone and it helps to remind the players that we're there and were aware of whats going on.
That being said I sometimes see just the opposite, guys being too vocal. In the 3rd and 4th qtr talking about the same things they were talking about in the 1st. At some point they need to bang the kid so he realizes that the offensive action needs to stop.