Has an AFL game ever ended 103-66?
Exactly once. On August 19, 1922, Essendon beat Richmond 103-66, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 103-66 in league history.
That makes 103-66 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 104-66 has happened 3 times and 103-67 has happened 3 times.