Aww, but he was a nice vandal!
Fort Sumpter [sic] was attacked by the rebels...thank God we have a government.
After hearing the news, Watchmaker Jonathan Dillon scrawled this, along with his name, the date and a short account of the attack at Fort Sumter, the event that sparked the American Civil War, behind the watch's face. The inscription has been a thing of legend since it was mentioned in a 1905 New York Times interview with Dillon himself, but has only now been revealed by the National Museum of American History. They've had the watch for years, but finally cracked it open to check for the inscription after the watchmaker's great-great-grandson was all like, "dude, it's there." It was.
I guess the modern equivalent would be a hidden text file in Obama's BlackBerry. What would it say?