Where did the term the goalie is standing on his head come from?

The term was first used after NHL President Frank Calder, in reference to new rules allowing a goalie to leave their feet, said "they can stand on their heads as far as I'm concerned"; it is now used to describe multiple saves in quick succession, often without the goalie being able to reset themselves in position and using the aforementioned rule allowing them to be off their feet, such as when they stack the pads to try and save a quick rebound shot.