First lady Mary Todd Lincoln — who has been cited as the most eccentric American First Lady of all time — is said to have held occult gatherings in an attempt to communicate with the dead, including the Lincolns' son Willie, who died during his father's first term. What's more, she claimed to have psychic abilities and swore that she had foreseen her husband's election. If only she had warned him not to attend Ford's Theatre on April 14, 1865.