Killing a bear before one's fourth birthday. Comes from the Ballad of Davy Crockett, which states that Davy "kilt him a b'ar bear when he was only three."
"As five-year-old Amos stood over the body of the ferocious grizzly, he knew he would always regret failing the Davy Crockett Challenge"
by SpaceisOverrated December 12, 2014