The vacuum cleaner sitting in the middle of the living room means Christine cleaned the house. Therefore, no vacuum clearly means no cleaning.

This appears to be Christine's husband's logic.

So she'll always leave proof of the day's householding tasks in strategic spots, and harvest the praise for a job well done.

Most of the time, her husband's blind spot makes her seethe—except when it gives her the freedom she needs to take care of business.