Having all fans turn their collect back to the floor when Crean is introduced? A message needs to be sent in some way. I've never booed a home team, only refs after a bad call. The heat needs to be turned up on the 'coach'.
Crean is FAR from an amateur. Last season I had a difficult time thinking the players could differentiate between Crean boos and team boos; however, they don't live under a rock.