Roy is a freak in net, his head bobbing like a toy doll as he mumbles to himself. They do it because there has to be a valve to release at least some of the pressure of their position. Whereas a Modano or a Hull may go through scoring lulls, if a goalie allows one deflection off a skate that caroms off the post through the net it can make the difference between his team winning the Stanley Cup or not. If the goalie makes a mistake, it's usually a goal. And because of that goal, he's the one who usually shoulders the blame for a loss.
People always remember the negative stuff more than they do the positive.
And imagine being Bill Buckner three or four times a week. For seven months. Nine if his team is good. Ten if they advance to the Stanley Cup Finals.