Andrew Johnson was an unlikely president: A runaway indentured servant who had never attended a day of school in his life, Johnson could not even write (and could barely read) until his wife undertook to teach him how. Nonetheless, he did manage to show up for his own inauguration -- barely. The problem? He was drunk.
[Johnson was in fine company. So many people were thronging the Capitol in celebration that he had to climb over a wall and enter the building from the basement to attend.]