Has an AFL game ever ended 100-91?
Yes. AFL has seen a final score of 100-91 3 times. It first happened on July 25, 1959, when Geelong beat Hawthorn, and most recently on April 5, 2010, when Geelong beat Hawthorn.
That makes 100-91 the 1534th most common final score out of 6,607 that have ever occurred in AFL. One point away, 101-91 has happened 1 times and 100-92 has happened 5 times. At one point the score disappeared for 41 years, between 1959 and 2000.