“Although daredevils in barrels have survived a plunge over Niagara Falls, the unidentified man who went over the edge Tuesday is believed to be the first person ever to survive the drop without the aid of some kind of flotation device. The man, who witnesses said had a smile on his face as he climbed over the railing near Horseshoe Falls, disappeared for several minutes before reappearing a few hundred feet downstream. Refusing help from a tour boat, he swam to shore and was promptly arrested.”
From Wired News