Has an AFL game ever ended 111-31?
Exactly once. On July 3, 1909, Sydney beat Geelong 111-31, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 111-31 in league history.
That makes 111-31 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 112-31 has happened never and 111-32 has happened never.