.Oh my! what an interesting 'secret' to have! (it's a pity the title gives it away).
More details after the jump.
‘Samuel James Seymour’s appearance on the CBS television show, “I’ve Got a Secret.”, 1956. At 96 years of age, Seymour was the last surviving person present at Ford’s Theater the night Abraham Lincoln was assassinated by John Wilkes Booth (April 14, 1865).
‘Only five years old at the time, Mr. Seymour traveled with his father to Washington D.C. on a business trip, where they attended a performance of Our American Cousin.’
- (thanks to Open Culture via Retronaut)