A little girl is watching her mother prepare the Christmas ham for dinner in the way that she always does every Christmas. As usual, she notices her mother cutting off the edges to make it into a square shape before putting it into the oven.
This year, she was curious and asked her mother, “why do you cut the edges off the Christmas ham?”
Her mother stopped and paused for a second and said, “That’s a very good question. When I was a little girl, I used to watch my mother doing the same thing. Let’s call Grandma and see what’s up.”
So they called up Grandma, and they said, “why is that you used to cut the edges off the Christmas ham?”
And Grandma said, “well, that’s because every year Grandpa used to get a ham for a bonus. And our oven was so small that I had to cut off the edges to make it fit.”
And so they realized that it was no longer necessary to cut off the edges and from that moment onwards, they decided not to cut the edges off the ham.