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Tsutomu Yamaguchi, who survived both bombs
In Hiroshima on business, home in Nagasaki in time for the second.
Yamaguchi was a young engineer on a work trip to Hiroshima on 6 August 1945, about three kilometres from the hypocentre when the bomb detonated. He was burned, temporarily blinded and deafened in one ear, and spent the night in an air raid shelter.
He then travelled home — to Nagasaki, where he arrived on 8 August. On the 9th he was describing the blast to his supervisor, who was refusing to believe a single bomb could destroy a city, when the room went white again.
He is the only person officially recognised by Japan as having survived both. He lived to ninety-three, spending his later years campaigning against nuclear weapons.
I could have died on either of those two days. Everything that follows is a bonus.
Whether this is luck at all is a fair question. He survived two things almost nobody survived, and then lived with the consequences of both for sixty-five years.