Herbert Hoover

Since President Hoover was a Quaker he did not take an oath of office. He affirmed his presdency.
President Hoover was one of two Presidents who did not accept a salary for being President. He donated his salary to charity.
Charles Curtis, Hoover's vice president, was the only nonwhite person to be elected vice president of the U.S. He was a Kaw Indian.
When the Hoovers wanted to speak privately while in the presence of White House guests, they spoke Chinese.