This fit an in-joke more than perfectly
One of the first times my (now) wife met my sons, my teen son, in a pensive moment, blurted, "Dad, why is my right arm bigger?" My wife had to leave the restaurant to regain her composure. (Fortunately, he did not hold it against her, and they get along perfectly now).
Anyway, despite it being Ripped Bear's left arm that's bigger, they clearly each needed one. Thanks!