The Thayer Amendment: This 1866 law prohibited the use of the image of any living person on "the bonds, securities, notes, or postal currency of the United States." It was an outgrowth of a silly act of vanity committed by Treasury Department official Spencer Clark, who decided to put himself on banknotes intended to honor explorer William Clark, of Lewis and Clark fame. The congressional bill authorizing the creation of the note only specified that it should honor "Clark," and so Spencer Clark decided to memorialize himself.
Presidential $1 Coin Act: This 2005 law outlined the circumstances for creating a series of $1 coins honoring American presidents. The law explicitly stated, "No coin issued ... may bear the image of a living former or current President, or of any deceased former President during the 2-year period following the date of the death of that President."
Britannica.com
Paul Simon - Father And Daughter
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