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 he existed, until he got sloppy. one night while i slept, he ate all of my chips and left

behind a big mess. when i awoke to this sight, i knew what had happened to my chips. so the

next night when he returned for another snack, he found a nice, delicious piece of

lightly balanced on a mouse trap. now i don't have to share my chips anymore.

7. what is the theme of this story?