Michelangelo was only 15 when his nose was crushed by fellow art student, Pietro Torrigiano. One day, Michelangelo, sharp-eyed critic that he was, kept pointing out the flaws in other students' frescoes when the frustrated Torrigiano punched him in the face. The blow knocked Michelangelo unconscious and left him with a lifelong facial disfigurement, an incident that colored his adult life with insecurity and depression.
Torrigiano, however, had it worse. A few years later, he was sentenced to death after destroying a painting of a saint. Now his only legacy is as the guy who ruined Michelangelo's face.