Two monks and a squabble

Once upon a time there were two monks who had lived together for forty years and never had a squabble. Not even once.
One day, one monk said to the other:
“Don’t you think it’s about time we had a squabble, even if it’s just once?”
“Sure,” replied the other monk.
“Let’s get started right away. About what shall we squabble?”
“About this piece of bread perhaps?” the first monk offered.
“OK, let’s have a squabble over this bread. How are we going to go about this?” asked the other again.
“This bread is mine, and mine alone,” said the first monk.
“Oh yeah? Well you can keep it,” said the second monk.