What is the rarest thing to do in baseball?

The rarest thing to do in baseball is called a perfect game. It happens when a pitcher on a team throws a complete game without allowing any opposing player to reach a base. This means no hits, no walks, no errors, and no hit-by-pitch. It is extremely difficult to achieve because it requires the pitcher to consistently throw accurate pitches for the entire game. Only 23 perfect games have been recorded in the history of Major League Baseball, which has been played for over 100 years. Some famous examples of perfect games include the ones thrown by baseball legends such as Sandy Koufax, Roy Halladay, and Felix Hernandez.