Martin Luther flunked out of law school and then joined up as a Catholic priest, not content to mess up simply law school he flunked out of history as well and tried to write himself a new religion.
From Martin Marty’s bio of Luther via Wiki:
Hans Luther was ambitious for himself and his family, and was determined to see his eldest son become a lawyer. He sent Martin to Latin schools in Mansfeld, then Magdeburg in 1497, where he attended a school operated by a lay group called the Brethren of the Common Life, and Eisenach in 1498.[14] The three schools focused on the so-called “trivium”: grammar, rhetoric, and logic. Luther later compared his education there to purgatory and hell.[15]
At the age of seventeen in 1501, he entered the University of Erfurt — later describing it as a beerhouse and whorehouse[16] — which saw him woken at four every morning for what Marty describes as “a day of rote learning and often wearying spiritual exercises”[16] He received his master’s degree in 1505.[17]
In accordance with his father’s wishes, he enrolled in law school at the same university that year, but dropped out almost immediately, believing that law represented uncertainty.[17] Marty writes that Luther sought assurances about life, and was drawn to theology and philosophy, expressing particular interest in Aristotle, William of Ockham, and Gabriel Biel.[17]