Has an AFL game ever ended 99-79?
Exactly once. On July 7, 1934, Fitzroy beat Hawthorn 99-79, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 99-79 in league history.
That makes 99-79 the 3836th most common final score out of 6,607 that have ever occurred in AFL. One point away, 100-79 has happened 6 times and 99-80 has happened 4 times.