When Ronald Reagan survived the attempt on his life on March 30, 1981, and went on to serve two full four-year terms, he broke what some people call “the year-ending-in-zero” curse.
It goes like this: Every President elected in a year ending in zero since 1840 had died in office.
William Henry Harrison, elected in 1840, died after one month in office of pneumonia; he also was our shortest serving President. On his inauguration day, then on March 4, he gave a two-hour speech without hat or topcoat, then rode through the streets of Washington. He was succeeded by John Tyler. (Remember Tippecanoe and Tyler too!)
Abraham Lincoln, elected in 1860, was assassinated a month into his second term, on April 12, 1865, by John Wilkes Booth. He was succeeded by Andrew Johnson.
James A. Garfield, elected in 1880, was assassinated in 1881 after only 199 days in office, succeeded by Chester A. Arthur. William McKinley, elected in 1896 and reelected in 1900, was mortally wounded in September 1901 and died eight days later, succeeded by Theodore Roosevelt.
Warren G. Harding, elected in 1920, died in 1923 of a heart attack and was succeeded by Calvin Coolidge. Franklin D. Roosevelt, elected to his third term in 1940, died early in his fourth term in April 1945 and was succeeded by Harry S. Truman.
And John F. Kennedy, elected in 1960, was assassinated in Dallas on November 22, 1963, succeeded by Lyndon B. Johnson.
The only other President to die in office was not elected in a year ending in zero. He was Zachary Taylor, who was elected in 1848 and died in 1850, being succeeded by Millard Fillmore.
George W. Bush, elected in 2000, served out his two full terms; the curse appears to be broken.