It was about 10:20 a.m., during fourth period on a recent Friday at North Allegheny Senior High School, and Rob Greenleaf was teaching his sociology class. He doesn’t remember what happened next.

GLASGOW, Ky. (WDRB) -- Some of the best friendships form over laughter. Jackson Farmer learned that early in life. "First year we met, he was a kindergartener, and he cracked a joke at me," the boy's ...