Has an AFL game ever ended 181-91?
Exactly once. On September 2, 1989, Hawthorn beat St Kilda 181-91, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 181-91 in league history.
That makes 181-91 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 182-91 has happened never and 181-92 has happened 1 times.