Has an AFL game ever ended 121-115?
Exactly once. On May 30, 1936, Fitzroy beat Geelong 121-115, and no AFL game before or since has ended that way. When it happened it was a scorigami, the first 121-115 in league history.
That makes 121-115 the 3884th most common final score out of 6,649 that have ever occurred in AFL. One point away, 122-115 has happened 1 times and 121-116 has happened never.