The lock on the door. The guy who shows up to inform you that the game is over. The closer.
In the game of baseball, there is probably no position more ridiculed than that of a closer. Many teams have tried to do without, using a “bullpen by committee.” For some reason, that never works.
Teams are just inexplicably better when they have a shut down pitcher at the back end of their pitching staff who can take the ball at the beginning of the ninth inning and can shut the other team out. Or if he blows the game wide open, forget about it the very next night when he has to do the same thing.