If I was on the ice, every time I got a chance to clear the puck or dump the puck in, I would be aiming at the refs every time as hard as I could.
They also like to block zone entries by standing on the line directly in front of players. Refs should start getting bowled over. I notice that each night the Canucks give the refs the benefit of the doubt, play around them and generally don't touch them. Then as the game goes on, they just go through them, shoot at them, etc.