Has an AFL game ever ended 158-81?
Exactly once. On June 24, 1967, Richmond beat Melbourne 158-81, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 158-81 in league history.
That makes 158-81 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 159-81 has happened 2 times and 158-82 has happened 2 times.