Has an AFL game ever ended 155-51?
Yes. AFL has seen a final score of 155-51 2 times. It first happened on June 19, 1976, when Geelong beat Sydney, and most recently on August 20, 2017, when Richmond beat Fremantle.
That makes 155-51 the 2421st most common final score out of 6,607 that have ever occurred in AFL. One point away, 156-51 has happened never and 155-52 has happened never. At one point the score disappeared for 41 years, between 1976 and 2017.