As a goalie, I have one rule.
Don't use your stick to block a shot.
I hate playing with d-bags who give a 50% effort and try to block a shot with the shaft of their stick or the tip of their blade.
Yeah, all you did was change direction of the puck and now that soft shot that was going to hit me in the centre of my chest is now going into an open corner and i can't do anything abou it. Way to go!

Now I look like crappy goalie because I couldn't stop a shot from 60 feet away with nobody in front of me.
It's probably the one thing about being a goalie that would make me go postal one day.