The intangible aspects of baseball are overblown. Outside of Little League, good sportsmanship is no substitute for being good at sports, and playing the game the right way isn't nearly as important as playing the game well.
But while a pat on the back might not make much of a difference on the field, a slap in the face will. A happy team won't get a huge boost in the game, but a frustrated team is at a big disadvantage.
In this slideshow are the 50 biggest clubhouse distractions—feuds, steroid allegations, legal problems, tragedies, and media pressures—in baseball history, ranked by severity, duration of time (a single isolated incident might not affect chemistry long-term) and consequences.
Remember to keep your eye on the ball!