The little grey mouse that lived in my wall prospered for many days on nibbles of my lunch. I'd pack a meal before bed and, while I slept, he would take small bites of my lunch, which I left on the counter. He'd take a cracker crumble here, and a bread crumb there, but he wouldn't take too much and he'd always clean up after himself. Things were going quite well for him and I didn't even know that he existed, until he got sloppy. One night while I slept, he ate all my chips and left a big mess. When I awoke to this site, I knew what had happened to my chips. The next night he returned for another snack. He found a nice, delicious piece of cheese... lightly balanced on a mousetrap. Now I don't have to share my chips anymore. What is the theme of this story?
What happens in this story that leads you to believe this?​