One day a little girl was watching her mom make a roast
beef. She cut off the ends, wrapped it in string, seasoned
it, and set it in the roasting pan.
The little girl asked her mom why she cut off the ends of
the roast. Mom replied, after some thought, that it was the
way that her mother had done it.
That night Grandma came to dinner and the little girl and
her mom went to her and asked why she had cut the end off of
the roast before cooking. After some thought, Grandma
replied that it was the way her mother had done it.
Now the great-grandmother was quite old and in a nursing
home. But the little girl went with her mom and grandma to
see her and again asked the question.
Great-Grandma looked at them a bit annoyed and said, "So it
would fit in the pan, of course."