They say goalies should always be cool, calm and collected.
They say goalies should always be the most composed and stoic players on the ice, too. No egregious celebrating, no display of emotion when giving up a goal, winning a game, or when their team scores.
They say goalies should essentially move, think and look exactly the same, no matter what is happening, all the time.
When I hear people say these things, I tend to worry.