"The prize he was awarded was a large clock that was equipped with a hand that indicated the sixty-first second — the “leap second”—and minute and hour hands that puzzlingly indicated seconds. The prize money was $10 trillion, although the unit of currency was not US dollars but rather Zimbabwe dollars, which had been discontinued at the time he received the prize. In fact, the prize money was worth about ¥170."

I love the Ig Nobels