Has an AFL game ever ended 120-80?
Yes. AFL has seen a final score of 120-80 2 times. It first happened on June 15, 1970, when Hawthorn beat Fitzroy, and most recently on September 1, 2002, when Adelaide beat Fremantle.
That makes 120-80 the 2496th most common final score out of 6,649 that have ever occurred in AFL. One point away, 121-80 has happened 4 times and 120-81 has happened 6 times. At one point the score disappeared for 32 years, between 1970 and 2002.