Once upon a time a very long time ago there was a mouse who lived in a very small house indeed. The house in fact was so small that the mouse had barely room to turn around and every time mousy would turn around he'd bump his tail and after a while his tail got to feeling kind of poor and he needed to find a bigger house.
So one day when he was out exploring he did find a bigger house but there was already somebody else living in it. Fortunately she was a friendly little mouse and he appreciated that very much. So he thought perhaps he ought to go home and gather up one of his most precious objects and offer it to her and ask if he could perhaps take a room in her bigger house - and so he did.
He gathered up a very shiny bottle cap that he had discovered somewhere and that he had been using to protect his back by putting it on the wall in just the right place so that when he turned, his back would rub against it and it wouldn't hurt but he didn't have anything to protect his tail.
So he brought the shiny bottle cap over and he presented it to her as a gift. She was very pleased and impressed and she said that she would allow him to stay in her spare room.
Well he was so pleased he rushed right home, gathered up all his possessions - and there weren't very many of course because his house was so small, and he rushed back to her house and moved into the spare room. It was so big he didn't have to worry at all about bumping his tail.
And do you know - they got to be friends and after a while they became Mr. and Mrs. Mouse and after a while they had little meeces and after a while they lived happily ever after.
It just goes to show that sometimes the littlest things, even a nice old shiny bottle cap, can make for happiness in the long run.