Has an AFL game ever ended 162-31?
Exactly once. On May 4, 1991, St Kilda beat Adelaide 162-31, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 162-31 in league history.
That makes 162-31 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 163-31 has happened never and 162-32 has happened never.