Tsutomu Yamaguchi was in Hiroshima on a business trip on August 6, 1945, when the U.S. flash-broiled thousands of Japanese citizens (a disproportionate number of the them children who were set to work making firebreaks in the city) in the area, in order to intimidate the U.S.S.R. with our new wonder-weapon.
He survived the attack and returned to his hometown of Nagasaki -- just in time for the second nuclear massacre.
I'm not sure if this is a very lucky man to have survived two mass killings, or a very unlucky man to have been present at them.